The purpose of following program fragment b = s + b; [Programming with C]

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The purpose of following program fragment

b = s + b;
s = b - s;
b = b - s;

Where s, b are two integers is to

Options are:

A. transfer the contents of s to b
B. transfer the contents of b to s
C. exchange (swap) the contents of s and b.
D. negate the contents of s and b

Correct answer is:

C. exchange (swap) the contents of s and b.