What is needed to verify that a landing page which is blacklisting an email channel for a profile, is working?

What is needed to verify that a landing page which is blacklisting an email channel for a profile, is working?
A . A test profile subscribed to a service
B . A test profile
C . A profile
D . A blacklisted profile

Answer: C

Explanation:

Reference: https://docs.adobe.com/content/help/en/campaign-standard/using/profiles-and-audiences/ understanding-opt-in-and-opt-out-processes/about-opt-in-and-opt-out-in-campaign.html