In Any Study There Should Be Two Pretests,the First Should

Multiple Choice

In any study there should be two pretests,the first should be conducted by ____ and the second by ____.

A) personal interview,mail
B) the planned method of administration,mail
C) personal interview,the planned method of administration
D) the planned method of administration,the planned method of administration
E) There is no one best way to conduct the pretests.