Program status word (PSW) contains the various status of

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ESE Mechanical 2014 Official Paper - 2
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  1. program
  2. CPU
  3. ALU
  4. register

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Option 2 : CPU
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Concept:

Program status word or PSW is a collection of all status bit conditions in the CPU at some time.

It includes the status bits from the last ALU operation and it specifies the interrupts that are allowed to occur and whether the CPU is operating in that supervisor or user mode. The mode that the CPU is operating at any given time is determined from the special status bit in the PSW.

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