Which of the following definitions describe open source software?

A.
Freeware

B.
Gnu Public License (GPL) software

C.
Public domain software

D.
Software released with source code

Explanation:
Answer D is correct; open source software has publicly released source code.

Incorrect Answers and Explanations: A, B, and C: Answers A, B, and C are incorrect. Freeware is software that is free of charge, whether source code is available or not. Software licensed with the GPL is free (libre), but not all open source software is licensed under the GPL. The same is true for public domain software.