APIs are defined as which of the following?

A. A set of protocols, and tools for building software applications to access a web-based software application or tool
B. A set of routines, standards, protocols, and tools for building software applications to access a web-based software application or tool
C. A set of standards for building software applications to access a web-based software application or tool
D. A set of routines and tools for building software applications to access web-based software applications