Which of the following statement about content type in SharePoint is NOT correct?

Question $1$Select one:

a$.$

A good CMS should provide precise content types in a fine granularity for users to choose from.

b$.$

Audio and Video are two build$-$in content types in SharePoint.

c$.$

The end user cannot create a new content type.

d$.$

Document Set is a child content type of Document which is a build$-$in content in SharePoint.