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Shift Registers - Technical MCQs

Q1:

What type of register would have a complete binary number shifted in one bit at a time and have all the stored bits shifted out one at a time?

A parallel-in, parallel-out

B parallel-in, serial-out

C serial-in, parallel-out

D serial-in, serial-out

ANS:C - serial-in, parallel-out

I think it should be serial-in, serial-out.