A/an _____________ is a class written in Apex that adds to or overrides behavior in a standard or
custom controller.

A.
Custom component
B.
Controller extension
C.
Apex extension
D.
Extended Controller
E.
Component extension
F.
None of these
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Extended Controller OR controller extension?
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I choose D
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https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_intro_what_is_it.htm
A controller extension is a class written in Apex that adds to or overrides behavior in a standard or custom controller. Extensions allow you to leverage the functionality of another controller while adding your own custom logic.
Correct Answer is: B
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