Microprocessor
The stack pointer

 resides in RAM
 resides in microprocessor
 may be in RAM or ROM
 resides in ROM

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Microprocessor
PUSH B instruction in 8085 microprocessor causes

 the contents of register B only to be copied in the stack
 registers B & C to be cleared
 the contents of registers B & C to be transferred in the stack and and the registers get cleared
 the contents of register B & C to be copied in the stack

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