对E-RABDropRate的统计哪个计算方式是正确的()
A.Number of normally released E-RAB / Number of successfully established E-RAB x 100% B.Number of abnormally setup E-RAB / Number of successfully established E-RAB x 100% C.以上都不对 D.Number of abnormally released E-RAB / Number of successfully established E-RAB x 100%