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 SUCCESSFULLYﻪESTABLISHED E－RAB X 100％
B.NUMBER OF ABNORMALLY SETUP E－RAB ／ NUMBER OF SUCCESSFULLYﻪESTABLISHED E－RAB X 100％
C.NUMBER OF ABNORMALLY RELEASED E－RAB ／ NUMBER OF SUCCESSFULLYﻪESTABLISHED E－RAB X 100％
D.以上都不对
正确答案是C