In the authorization graph, if DBA provides authorization to u1 which in turn gives to u2 which of the following is correct?
If DBA revokes authorization from u1 then u2 authorization is also revoked
If u1 revokes authorization from u2 then u2 authorization is revoked
If DBA & u1 revokes authorization from u1 then u2 authorization is also revoked
If u2 revokes authorization then u1 authorization is revoked
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