Consider Multics procedures p and q. Procedure p is executing and needs to invoke procedure q. Procedure q’s access bracket is (5, 6) and its call bracket is (6, 9). Assume that q’s access control list gives p full (read, write, append, and execute) rights to q. In which ring(s) must p execute for the following to happen?
A) p can invoke q, but a ring-crossing fault occurs.
B) p can invoke q provided that a valid gate is used as an entry point.
C) p cannot invoke q.
D) p can invoke q without any ring-crossing fault occurring, but not necessarily through a valid gate
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