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

#include <iostream>
using namespace std;
class sample
{
    public:
    virtual void example() = 0; 
};
class Ex1:public sample
{
    public:
    void example()
    {
        cout << "ubuntu";
    }
};
class Ex2:public sample
{
    public:
    void example()
    {
        cout << " is awesome";
    }
};
int main()
{
    sample* arra[2];
    Ex1 e1;
    Ex2 e2;
    arra[0]=&e1;
    arra[1]=&e2;
    arra[0]->example();
    arra[1]->example();
}

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