Q. What is the difference between struct and class in C++?

(A) all members of a structure are public and structures don't have constructors and destructors

(B) members of a class are private by default and members of struct are public by default. when deriving a struct from a class/struct, default access-specifier for a base class/struct is public and when deriving a class, default access specifier is private.

(C) all members of a structure are public and structures don't have virtual functions

(D) all above