Fill the comment section of the program (indicated by //C...) and guess the output of the following code: #include using namespace std; class Room { double length; double breadth; public: // Room() { length = 6.9; breadth = 4.2; } C2 Room(double I, double b) { length = 1; breadth = b; 3 C3 Room(double len) { length = len; breadth = 7.2; } double calculateArea() { return length * breadth; int main() { Room room, room2(8.2, 6.6), room3(8.2); cout