5. þ A, B, and C. Any of these will prevent the access.
ý D and E. D is wrong because the grants in (a) and (b) will remain in
effect. Note that ALL is implemented as a set of grants (or revokes) of each
privilege, so it is not necessary to grant or revoke SELECT as well as ALL. E is
wrong because the grant to PUBLIC in (d) will remain in effect.
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