What will be the output of the following C code?

#include <stdio.h>
#define p( n ) printf( "t" #n " = %d", t##n )
int t3=10;
int main()
{
   p(3);
}

A. Compile C code B. Optimize code C. Preprocess code before compilation D. Execute code

A. #define B. #include C. #ifdef D. #pragma

A. To include a header file B. To define a macro C. To declare a constant D. To declare a variable

A. #ifdef B. #ifndef C. #if D. #else