What is the output of the following program?
```
#include
using namespace std;
class TestClass
{
public:
TestClass(int x)
{ cout << x << endl; }
TestClass()
{ cout << "Hello!" << endl; }
};
int main()
{
TestClass test;
return 0;
}
```
a. the program runs but there is no output.
b. 0
c. Hello!
d. the program will not compile
c. Hello!
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