What will be the output of the following C++ code?

#include <iostream>
int const s=9;
int main()
{
    std::cout << s;
    return 0;
}

A. .cpp B. .cc C. .cxx D. .c

A. char B. float C. boolean D. double

A. File output stream B. File input stream C. Standard output stream D. Standard input stream

A. struct B. interface C. class D. object