Correct, N Y Y
1st - No, dataverse DB is optional. In fact, if you go to Power Platform Admin Center and create a new environment, there is a yes/no slider for "create dataverse DB". Woudln't have an option to select No if it was mandatory.
2nd - Yes, from MS Press Exam Ref book page 45 - "The data stored within a dataverse DB is only accessible to apps and flows created in the same environment. This can be useful to separate app, flow developments, or testing projets to different teams, or testing/prod environments."
3rd - Yes, "The Dataverse for Teams environment is automatically created for the selected team when you create an app or bot in Microsoft Teams for the first time or install an app created using Power Apps from the app catalog for the first time."
https://learn.microsoft.com/en-us/power-platform/admin/about-teams-environment
I disagree with you in 2nd because the question says "connect to the data sources" and there are more datasources than Dataverse for Power Apps.
The most common data sources are tables, which you can use to retrieve and store information. You can use connections to data sources to read and write data in Microsoft Excel workbooks, lists created using Microsoft Lists, SharePoint libraries, SQL tables, and many other formats, which can be stored in cloud services such as OneDrive for Business, DropBox, and SQL Server.
Data sources other than tables include email, calendars, Twitter, and notifications, but this article doesn't discuss these other kinds of data sources.
As i understand, if you have an app in an environment you also can connect to local data sources or twitter or to a sql database out of the microsoft environment.
I agree with ManuCorbe. To extend, power apps can connect to any other database. Power automate can connect to around 900+ connectors and growing. There are many databases which it can connect in those list. Microsoft do not want to limit their product to just utilize their own environment.. So, It can call any other call other databases after this big investment :)
In Q 2, it is not saying that app can only use data from Dataverse. The app can definetely connect with other data sources using connectors - but all these data sources will be available to the app within the same environment. Option states "data sources" which include Dataverse and 600 + connectors.
For Q2 the answer should be 'Yes' because even if the app uses Dataverse or one of those 600+ connectors, that is possible and specific within the same environment (A). Any other application that belongs to another environment B cannot use the "same" data sources and connections that are deployed/configured into environment A. Rather, we need to create new connections/configurations into environment B.
When you create an app in an environment, that app is only permitted to connect to the data sources that are also deployed in that same environment, including connections, gateways, flows, and Dataverse databases
https://learn.microsoft.com/en-us/power-platform/admin/environments-overview
The answer is Y
N, N, Y
An app can connect to data sources that are not within the same env such as outside/external data sources. it can only connect to a Dataverse within the same environment but other data sources can be external
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