C++ Programming - OOPS Concepts - Discussion

Encapsulation means protecting data from other programmers in real programming world which can be achieved by the making data variable as private data. The private data variable can only be accessed inside the declared class if we want to allow to access the value to other programmers we provide the another way that is better and setter method for that private variable.

So by better and setter method we allow the another programmer to access the variable we doing this as Abstraction and When we declare the private methods which means we are doing encapsulation.

Abstraction is the correct answer.

What is the difference between abstraction and data hiding? and why the answer is data hiding and not an abstraction.

I think the answer should be abstraction.

First thing data hiding is a feature of OOPS Concept and not a pillar of OOPS, the question is clearly asking "Which of the following concepts of OOPS means " So, according to me, that data hiding can't be the correct answer.

Here,

Data abstraction is the right answer.
Data abstraction means showing the essential info to the user.
Whereas data hiding is just way to hide the info from the user.
(how to achieve data hiding -- private, protected, public).

Data hiding is part of data abstraction.

The answer is abstraction as it hides the complexities from the user and shows only the essential features. Whereas data hiding is hiding the data altogether from the user.

It hides the data and expose only some information which is declared in the person class but we can access it by public variable.

If you consider the broad meaning, data hiding may seem right. But to be very precise, DATA ABSTRACTION should be the correct answer.