What should the admin do to prevent the prefix from deploying in live sends?

A Marketing Cloud admin wants to ensure email sends exclude their testing prefix of [PREVIEW] in the subject line when deploying from Email Studio.

What should the admin do to prevent the prefix from deploying in live sends?
A . Use Proof instead of [PREVIEW]
B . Add [PREVIEW] to the subject line validation list
C . Require several campaign approvals
D . Wrap the subject line with AMPscript

View Answer

Answer: B