Choose the correct definition for <apex:actionFunction>.
A.
Allows for controller methods to be called directly from Javascript. Must be encapsulated in <apex:form> tags. Unlike actionSupport, these function<apex:actionPoller>s can be called directly from Javascript code
B.
Sends an AJAX request according to the time interval you specify. If this ever gets re-rendered, it resets
C.
Adds AJAX support to another component (e.g. onClick, onMouseUp, onFocus, etc.)
D.
Can be associated with an AJAX request (actionFunction/actionSupport/actionPoller) and shows content conditionally depending on the status of the request (in progress/complete). Use the "id" field to specify name; use "status" field on related components to connect them
E.
Signifies which components should be processed by the server when an AJAX request is generated
A: provides support for invoking controller action methods directly from JavaScript code using an AJAX request. An <apex:actionFunction> component must be a child of an <apex:form>
https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_compref_actionFunction.htm
apex:actionStatus
A component that displays the status of an AJAX update request. An AJAX request can either be in progress or complete.
Use this component to get user input for a controller method that does not correspond to a field on an sObject.
apex:actionRegion. An area of a Visualforce page that demarcates which components should be processed by the Force.com server when an AJAX request is generated
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