单项选择题

对E-RAB Drop Rate的统计那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."Number of abnormally released E-RAB / Number of successfully established E-RAB x 100%"
D.以上都不对