（）appraisal is a type of performance evaluation that is done by one or more people of matching competencies.It is usually done among the members of the same team.This is a method employed to preserve the quality standard at a desired level.

（）appraisal is a type of performance evaluation that is done by one or more people of matching competencies.It is usually done among the members of the same team.This is a method employed to preserve the quality standard at a desired level.
A.Peer
B.Subordinate
C.Superior
D.Self
正确答案：Self