Explanation:None. 8. In authorization graph if DBA provides authorization to u1 which inturn gives to u2 which of the following is correct ?
A. If DBA revokes authorization from u1 then u2 authorization is also revoked .
B. If u1 revokes authorization from u2 then u2 authorization is revoked .
C. Both a and b
D. If u2 revokes authorization then u1 authorization is revoked .
Answer:A
Explanation:None. 8. In authorization graph if DBA provides authorization to u1 which inturn gives to u2 which of the following is correct ?
A. If DBA revokes authorization from u1 then u2 authorization is also revoked . B. If u1 revokes authorization from u2 then u2 authorization is revoked . C. Both a and b D. If u2 revokes authorization then u1 authorization is revoked .
Explanation:A user has an authorization if and only if there is a path from the root of the authorization graph down to the node representing the user. 9. Which of the following is used to avoid cascading of authorizations from the user ?