单项选择题
A.Call Drop Rate=LE-RAB AbnormRel/（LE-RAB AbnormRel+LE-RAB normRel）*100%
B.Call Drop Rate=LE-RAB AbnormRel/RRC ConnectionSetup Success*100%
C.Call Drop Rate=LE-RAB AbnormRel/LE-RAB Success*100%
D.Call Drop Rate=LE-RAB AbnormRel/LE-RAB normRel*100%