Which of the Following Statements About Account Planning Is True

Which of the following statements about account planning is true?

A) Account planners do not conduct any quantitative research.
B) Account planners work with the client as well as other agency personnel.
C) Account planners only work with the client to avoid agency bias.
D) With account planning,the agency takes a permanent leadership role in the development of creative strategy.
E) The knowledge gained during account planning can only be used during the planning period because it is proprietary information.