以下对于华为Probe&Assistant软件侧，掉话率公式定义正确的是以下哪个（）

A.Call Drop Rate=eRAB AbnormRel/eRAB Setup Success*100%
B.Call Drop Rate=eRAB AbnormRel/RRC Connection Setup Success*100%
C.Call Drop Rate=eRAB AbnormRel/ eRAB Release Total*100%
D.Call Drop Rate=eRAB AbnormRel// eRAB NormRel*100%