What will be the output of the program?_x000D_ #include_x000D_ #define SWAP(a, b) int t; t=a, a=b, b=t;_x000D_ int main()_x000D_ {_x000D_ int a=10, b=12;_x000D_ SWAP(a, b);_x000D_ printf("a = %d, b = %d\n", a, b);_x000D_ return 0;_x000D_ }

• A. a = 10, b = 12
• B. a = 12, b = 10
• C. Error: Declaration not allowed in macro
• D. Error: Undefined symbol 't'