Fill in the blank. The best practice for a/b testing two different calls to action for a __________ad is to test banners that are __________in every way, with the exception of the call to action.

Q: Fill in the blank. The best practice for a/b testing two different calls to action for a ad is to test banners that are in every way, with the exception of the call to action.

A) banner, different
B) text, identical
C) banner, identical
D) text, different

Correct Answer is C) banner, identical.