Question: What is the interface segregation principle?

1. Many client-specific interfaces are better than one general-purpose interface.
2. Software entities should be open for extension, but closed for modification.
3. A class should have only a single responsibility - that is, only changes to one part of the software's specification should be able to affect the specification of the class.
4. Objects in a program should be replaceable with instances of their subtypes without altering the correctness of that program.

Answer: The correct answer of the above question is Option A:Many client-specific interfaces are better than one general-purpose interface.