Exercise 2: Consider the following C++ program declaration This is not full program it is only like a pseudocode) class vehicle 2- 3 4 5 6 protected: int x; public: void f()1...J; d; class car: public vehicle protected: int x1; 8 9 b; class small_car: public car d; class truck: public vehicle f 10 12 13 14 15 16 17 18 19 20 21 public: int x2; public: f)f.. .^; int main () car obj1; 23 24 25 26 27 return For each of the following expressions, say whether it is allowed in the code of main or not; justify your answer. (you can edit and complete the code as you want to check your answers) objl.x, obj1.f) , objl.xl, objl.x2