SMART目标指的是什么?

SMART目标指的是什么?
A.Specific，Measurable,Attainable,Reasonable,Time-based
B.Smart，Measurable,Advanced,Relevant,Time-based
C.Smart，Measurable,Attainable,Reasonable,Time-based
D.Specific，Measurable,Attainable,Relevant,Time-based
标准答案：D