Which of the following is NOT true about digital forensics?

a$.$ Digital forensics is a subset of forensics, which is the application of science to questions that are of interest to the legal profession.

b$.$ Digital forensics involves the retrieval of difficult$-$to$-$obtain data, which is usually hidden, altered, or even deleted by the perpetrator.

c$.$ Digital forensics is often confused with e$-$discovery, although they are not the same.

d$.$ Digital forensics has evolved so that virtually anyone can perform it$.$