Which Statement Is True About the Skill Clusters Created for a Functional

Which statement is true about the skill clusters created for a functional resume?

A) The skills can be acquired from all kinds of experiences, both personal and work-related.
B) There should be at least five clusters, more if possible.
C) The skills should be limited to those acquired from paid employment.
D) There should be an explanation of how each cluster relates to the job you are applying for.