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A D flip-flop is used in a 4-bit serial adder, why?

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A D flip-flop is used in a 4-bit serial adder, why?

(a) It is used to invert the input of the full adder

(b) It is used to store the output of the full adder

(c) It is used to store the carry output of the full adder

(d) It is used to store the sum output of the full adder

I got this question in semester exam.

My query is from Fast Adder & Serial Adder topic in chapter Arithmetic Circuits of Digital Circuits

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The correct choice is (c) It is used to store the carry output of the full adder

Easy explanation: The D flip-flop, i.e. carry flip-flop, is used to store the carry output of the full adder so that it can be added to the next significant position of the numbers in the registers.

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