Explain briefly how loop unrolling, re-association, and separate accumulating help in performance optimization.   Re-write the following code using 2 x 2 unrolling.   void combine(int x[], int n, int *dest){         *dest = 0;         for (int i = 0; i < n; i++) {                *dest = *dest + x[i];         } }

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A: Output Screenshot:

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