Gate 2018 pyq C Programming | Consider the following C code. Assume that unsigned long int type

Consider the following C code. Assume that unsigned long int type length is 64 bits. unsigned long int fun(unsigned long int n) { unsigned long int i, j = 0, sum = 0; for( i = n; i greater_than 1; i = i/2) j++; for( ; j greater_than 1; j = j/2) sum++; return sum; } The value returned when we call fun with the input 2^40 is (A) 4 (B) 5 (C) 6 (D) 40