Microprocessor
When referring to instruction words, a mnemonic is

 a short abbreviation for the operand address.
 a short abbreviation for the data word stored at the operand address.
 shorthand for machine language.
 a short abbreviation for the operation to be performed.

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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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