After a serious brainstorming session involving three pages of word lists, Monroe came up with the following idea to increase senior citizen memberships at his local rock climbing gym: $$SUMMIT: Where old people climb mountains.$$ This brief phrase represents the creative strategy of this particular ad campaign and can be considered a$($n$)$

A$.$

advertising campaign.

B$.$

key consumer benefit.

C$.$

positioning strategy.

D$.$

input to creativity.

E$.$

tagline.