Long-Term Management of Creativity for an Established Brand or Brand

Long-term management of creativity for an established brand or brand item means guarding against which ONE of the following very common mistakes?

A) developing new advertising executions which inadvertently tap into a new key benefit
B) not rotating the advertising executions often enough in the media plan
C) not changing the key benefit claim often enough
D) using too many different executions of the same creative idea
E) not refreshing the campaign at six-month intervals