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

#include <iostream>
using namespace std;
class vec
{
    public:
    vec(float f1, float f2) 
    {
        x = f1;
        y = f2;
    }
    vec()
    {
    }
    float x;
    float y;
};
vec addvectors(vec v1, vec v2);
int main() 
{
    vec v1(3, 6);
    vec v2(2, -2);
    vec v3 = addvectors(v1, v2);
    cout << v3.x << ", " << v3.y << endl;
}
vec addvectors(vec v1, vec v2)
{
    vec result;
    result.x = v1.x + v2.x;
    result.y = v1.y + v2.y;
    return result;
};

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