The arr data member has been given to you, it is declared in the base class. Just use this->arr to access \ it in the derived class methods.\ A private int amount data member, which keeps track of the next open index in the array. Default \ initialize it to 0.\ A private int capacity data member. Default initialize it to 0.\ A constructor that accepts a const int parameter. This constructor needs to dynamically allocate an array \ of the size passed into the parameter. Use the new keyword to make this array. It should also set the \ capacity data member to the value of the argument passed in.\