以下对于华为Probe＆Asisstant软件侧掉话率公式定义正确的是＿＿＿＿＿
A.CALL DROP RATE＝ERAB ABNORM REL／ERAB SETUP SUCCESS＊100％
B.CALL DROP RATE＝ERAB ABNORM REL／RRC CONNECTION SETUP SUCCESS＊100％
C.CALL DROP RATE＝ERAB ABNORM REL／ERAB RELEASE TOTAL＊100％
D.CALL DROP RATE＝ERAB ABNORM REL／ERAB NORMREL＊100％
正确答案是A