對于度量績效域，有效的度量指標(biāo)應(yīng)該具備（）SMART特征。
A． Specific、Measurable、Attainable、Relevant、Time - bount
B． Strategic、Measurable、Achievable、Realistic、Time-bound
C． Specific、Measurable、Actionable、Relevant、Time-bound
D． Specific、Meaningful、Achievable、Relevant、Timely