Which of the following can be used as a prefix for Directive?*a) data-b) ng-c) All of the mentionedd) None of the mentioned

The correct answer is c) All of the mentioned.

In AngularJS, both "data-" and "ng-" can be used as prefixes for directives.

Here's a step-by-step explanation:

1. "data-" prefix: This is a HTML5 specification for custom attributes. When you use this prefix, your HTML will be valid and it will pass HTML5 validation tests.

2. "ng-" prefix: This is a default AngularJS prefix. AngularJS directives like ng-bind, ng-model, etc., all use this prefix.

So, both "data-" and "ng-" can be used as prefixes for AngularJS directives. Therefore, the answer is c) All of the mentioned.