What variable tag must be included in an email to allow prospects to manage their email preferences?

Posted by: Pdfprep Category: PDX-101 Tags: , ,

What variable tag must be included in an email to allow prospects to manage their email preferences?
A . %%opt_out%% or %%email_preference_center%%
B . %%unsubscribe %% or %% email_preference_ center %%
C . %%opt_out%% report_spam %%
D . %%unsubscribe % or %% opt_out %%

Answer: B