Which of the Following Is/are True About Public Domain Programs

Multiple Choice

Which of the following is/are true about public domain programs?

A) Public domain programs and apps do not have restrictions on use,distribution,or modification.
B) Public domain programs and apps impose restrictions on use,distribution,or modification.
C) Lack of a patent,copyright,or trademark does not mean a program is public domain.
D) Public domain programs are available to the public normally for a fee.