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What allows the data protection in the software interrupt mechanism?

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What allows the data protection in the software interrupt mechanism?

(a) Different mode

(b) Same mode

(c) SWI

(d) TRAP

The question was asked during an interview for a job.

Question is taken from Sources of Interrupts in section Interrupts and Exceptions of Embedded Systems

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Best answer
Right choice is (a) Different mode

Easy explanation: The switching between user mode and supervisor mode provides protection for the processor, that is, the different modes in the software interrupt allows the memory and the associated code and data to be protected from each other.

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