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A.select*from scott.wz where wunit is null and rownum<5
B.select*from myuser.wz where wunit = null and rownum<5
C.select*from myuser.wz where wunit is null and rownum<6
D.select*form scott.wz where wunit is null and rownum<6

A.Grant drop any table to user1
B.Grant drop any table to user1 with admin option
C.Grant drop table to user1
D.Grant drop any table to user1 with check potion