Microprocessor
A microprocessor differentiates between op code, data/address at any time by

 the sequence in which memory contents are fetched by it
 the program counter
 its internal registers
 the stack pointer

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

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