题目内容
（请给出正确答案）
[主观题]
What expression is usually used for the paging success rate?()
A.Successful repeated page attempts (in location area) of total number of first and repeated page attempts (in location area)
B.Successful repeated page attempts (in location area) of total number of repeated page attempts (in location area)
C.Rate of discarded paging messages in the BSC
D.Successful first and repeated page attempts (in location area) of total number of first page attempts (in location area)
E.Successful first and repeated page attempts (in location area) of total number of first and second page attempts (in location area)
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