The two methods of course rescue that aggregate the features located in multiple classes are __________.

The two methods of course rescue that aggregate the features located in multiple classes are __________.

A.
Inheritance

B.
Copy and Paste

C.
Composition

D.
Refactoring

E.
Virtual Method Invocation

Explanation:
C: Composition is a special case of aggregation. In a more specific manner, a
restricted aggregation is called composition. When an object contains the other object, if the
contained object cannot exist without the existence of container object, then it is called
composition.
E: In object-oriented programming, a virtual function or virtual method is
a function or method whose behaviour can be overridden within an inheriting class by a function
with the same signature. This concept is a very important part of the polymorphism portion
of object-oriented programming (OOP).
The concept of the virtual function solves the following problem:
In OOP when a derived class inherits a base class, an object of the derived class may be referred
to (or cast) as either being the base class type or the derived class type. If there are base class
methods overridden by the derived class, the method call behaviour is ambiguous.
The distinction between virtual and non-virtual resolves this ambiguity. If the function in question is
designated virtual in the base class then the derived class’ function would be called (if it exists). If
it is not virtual, the base class’ function would be called.
Virtual functions overcome the problems with the type-field solution by allowing the programmer to
declare functions in a base class that can be redefined in each derived class.
Note:Aggregation is a special case of association. A directional association between objects.
When an object ‘has-a’ another object, then you have got an aggregation between them. Direction
between them specified which object contains the other object. Aggregation is also called a “Hasa” relationship.