Which of the following best describes a program in which we have multiple functions with the same name but they differ in terms of the number of parameters and types of parameters accepted by them?

1. Method overloading

2. Method overriding

3. Encapsulation

4. Abstraction

Which keyword must be used when a derived class is defining the implementation of a function that's present in the base class?

1. New

2. Abstract

3. Virtual

4. Override

1. Abstract

2. Private

3. Sealed

4. Protected