A computing system consists of four processors, P1, P2, P3, and P4, and four blocks of memories, M1, M2, M3, and M4. Processor P1 is allowed to use memory blocks M1 and M4 only. Memory block M2 can be used only by P2 and P3. Processor P3 can use all blocks of memories. All processors can use block M4. The circuit produces an active high output only if a processor uses an appropriate memory block. Write the entity and the architecture for the circuit.