The top of a memory stack contains 5000. The stack pointer SP contains 4000. A two-word procedure call instruction is located in memory at address 1000, followed by the address field of 502 at location 2001. What are the contents of PC, SP, and the top of the stack (a) before the call instruction is fetched from memory (b) after the call instruction is executed and (c) after the return from the procedure?
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