Which of the following is true of ex post facto laws?

A$.$ The U$.$S$.$ Constitution mandates the use of ex post facto laws in

jurisdiction.

B$.$ The constitutional provision relating to ex post facto laws applies

to both civil and criminal statutes.

C$.$ An ex post facto law is one that aggravates a crime, or makes it

more serious than it was when committed.

D$.$ The constitutional provision relating to ex post facto laws refers to

a judicial decision and not to a legislative enactment.