From the SOLID principles of object-oriented programming, which statement best describes the Liskov substitution principle?
Software entities should be open for extension, but closed for modification.
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.
objects in a program should be replaceable with instances of their subtypes without altering the correctness of that program.
Many client-specific interfaces are better than one general-purpose interface.