Suppose Sum,num,and J Are Int Variables,and the Input Is 4 $\quad$

Multiple Choice

Suppose sum,num,and j are int variables,and the input is 4 7 12 9 -1.What is the output of the following code?
cin >> sum;
Cin >> num;
For (j = 1; j <= 3; j++)
{
$\quad$ Cin >> num;
$\quad$ Sum = sum + num;
}
Cout << sum << endl;

A) 24
B) 25
C) 41
D) 42