Which of the following statements about API documentation are true?

		API documentation is largely unnecessary if the code has been designed to be self-documentating.
		API documentation focuses on how software is used rather than on how it works.
		API documentation has supplanted inline commenting as the primary form of source code documentation.
		API documentation clarifies the choice of implementing data structures and algorithms for a class.
		API documentation tools are not widely available for many popular programming languages.