Which of the Following Is True of Managerial Skills

Which of the following is true of managerial skills?

A) Management at any level is a science, not an art.
B) They are an art that can be learned, although no one can really teach you.
C) You do not have to be born with certain talents or personality traits.
D) Studies of outstanding top executives accurately identify common sets of traits that add up to successful leadership.
E) Human, technical and conceptual skills are needed by supervisors.