Main concepts in OOP

Question

I was once asked in an interview \'What are the 3 main concepts of OOP?\'. I answered by saying that in my opinion there were 4 which are as follows:

• Inheritan

Answer 1

That's correct.

If you had to provide only one, however, Abstraction it's got to be, for, one way or the other, the rest three is merely Abstraction in action.