SwitchCase in C MCQs Exercise II

Ques 1 SwitchCase

What is the output of the following code?
int main()
{
int a=5,b=12;
switch(a+b)
{
case 10::printf("case 0");
case 15:printf("case 1");break;
case 17:printf("case 2");break;
default: printf("SmallCode");
}
return 0;
}

A case 0