Which of the Following Statements About the C++ Standard Library

Which of the following statements about the C++ Standard Library is false:

A) The C++ Standard Library consists of classes and functions that perform tasks.
B) The C++ Standard Library is an important part of the C++ "world."
C) An advantage of using classes and functions from the C++ Standard Library is saving the effort of designing, developing and testing new classes.
D) The C++ Standard Library functions and classes are not included in every C++ implementation.