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%