What is the purpose of including operator overloading for iostreams in classes?

The purpose of including operator overloading for iostreams in classes is to enable easy printing and reading of class instances. File management and memory management are incorrect because they are not the main purpose, although they may be related to the use of operator overloading. Option C is incorrect because while operator overloading does override default behavior, this is not the main purpose for including it for iostreams in classes. The main purpose of operator overloading for iostreams in classes is to allow for convenient input and output operations for class instances.