Problem 4 (MULTICS): Consider Multics procedure p and data segment d. Procedure p is executing and needs to access segment d. Segment ds access bracket is (5, 6). Assume that ds access control list gives p full (read, write, append, and execute) rights to d. In which ring(s) must p execute for the following to happen? a. p can read, write to, and append to d. b. p can read d but not write to or append to d. c. p cannot access q.