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
正确答案：D