题目内容

若数据A持有事务T1所加的排它锁，那么其他事务对数据A（）。

A. 加共享锁成功，加排它锁失败
B. 加排它锁成功，加共享锁失败
C. 加共享锁、加排它锁都成功
D. 加共享锁、加排它锁都失败

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