What are various possible prefixes such as 'ng-' using which Angular directives (forexample, ng-app) can be defined?

'ng-', 'data-ng-', 'ng:', 'x-ng-'

What are various possible prefixes such as 'ng-' using which Angular d

1.	What are various possible prefixes such as 'ng-' using which Angular directives (forexample, ng-app) can be defined?
A.	'ng-', 'data-ng-', 'ng:'
B.	'ng-'
C.	'ng-', 'data-ng-', 'ng:', 'x-ng-'
D.	'ng-', 'data-ng-','x-ng-'
Answer» D. 'ng-', 'data-ng-','x-ng-'