If a Publication Is Available on a Controlled Basis,it Means

If a publication is available on a controlled basis,it means the:

A) publisher must run a series of marketing tests before new subscriptions can begin.
B) magazine is received free of charge by those individuals believed to be in a unique position to influence the purchase of advertised products.
C) publisher limits the number of copies available so that a premium price can be charged for each issue.
D) publisher limits the number of advertisers in the publication to a maximum of 20.
E) magazine is distributed through exclusive distribution channels rather than sent through the mail.