Exam 200-901 topic 1 question 148 discussion

I think it is A https://www.ciscolive.com/c/dam/r/ciscolive/us/docs/2019/pdf/5eU6DfQV/LTRCTR-2700.pdf

should be A, as in learning LABs from CISCO https://developer.cisco.com/learning/labs/intro-restconf/ RESTCONF Headers and MIME Types One of the major advantages RESTCONF has over NETCONF is its ability to use JSON as a data format. Many developers prefer JSON (over XML) because of its readability and lower overhead. When crafting a RESTCONF request, you specify the data format being sent and requested by the agent. This is done in a typical HTTP way; using request headers: Content-Type: Specify the type of data being sent from the client Accept: Specify the type of data being requested by the client RESTCONF describes the following MIME types to be used in these headers to indicate the format being requested. application/yang-data+json application/yang-data+xml

The correct MIME type for data transmitted using the RESTCONF protocol is application/yang.data+json, which indicates that the data is in JSON format and follows the YANG data model. Alternatively, if the data is transmitted in XML format, the MIME type would be application/yang.data+xml. Therefore, the correct line of code to place in the snippet where it is missing would be either {'Content-Type': 'application/yang.data+json', 'Accept': 'application/yang.data+json'} or {'Content-Type': 'application/yang.data+xml', 'Accept': 'application/yang.data+xml'}, depending on the format of the data being transmitted.

There is no such media type as application/restconf and as per the RFC of Restconf it can use application/xml or application/json

A has the only correcto syntax to retrieve on XML format

It's definitely A. RESTCONF supports JSON and XML, but option C says "restconf.data-json", which is incorrect syntax as "restconf" isn't a data type.