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

#include <iostream>
#include <ios>
#include <istream>
#include <limits>
using namespace std;
template <typename CharT>
void ignore_line ( basic_istream<CharT>& in )
{
    in.ignore ( numeric_limits<streamsize> :: max(), in.widen ( '\n' ) );
}
int main()
{
    cout << "First input: ";
    cin.get();
    cout << "Clearing cin.\n";
    cin.clear();
    ignore_line ( cin );
    cout << "All done.\n";
}

What does the 'sizeof' operator return in C++?

A. Size of a data type in bits

B. Size of a data type in bytes

C. Size of a variable in bytes

D. Size of a variable in bits

Which of the following is not a fundamental data type in C++?

A. Char

B. Float

C. String

D. Double

What is the purpose of the 'static' keyword in C++?

A. To declare a variable with dynamic storage duration

B. To declare a constant

C. To declare a variable with external linkage

D. To declare a variable with static storage duration

What is the difference between '++i' and 'i++' in C++?

A. None of the above

B. They both have the same effect

C. '++i' increments the value of 'i' before returning it, while 'i++' increments the value of 'i' after returning it

D. '++i' increments the value of 'i' after returning it, while 'i++' increments the value of 'i' before returning it