What Is the Difference Between Struct and Class in C

Multiple Choice

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