The content of the top of a memory stack is 5320. The content of the stack pointer SP is 3560. A two-word call subroutine instruction is located in memory at address 1120 followed by the address field of 6720 at location 1121. Specify the content of PC, SP, and the top of the stack in the following situations:
a. Before the call instruction is fetched from memory
b. After the call instruction is executed
c. After the return rom the subroutine
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