Which of the following feature of OOPs is not used in the following C++ code?

class A
{
    int i;
    public:
    void print(){cout<<"hello"<<i;}
}
 
class B: public A
{
    int j;
    public:
    void assign(int a){j = a;}
}

A. class B. struct C. typedef D. interface

A. Encapsulation B. Polymorphism C. Inheritance D. Instantiation

A. The process of creating multiple instances of a class B. The process of hiding the implementation details of a class C. The process of deriving a new class from an existing class D. The process of defining functions within a class

A. protected B. public C. friend D. None of the above