$21)$ Parol Evidence Rule means

A$)$ When seeking parole, this is evidence that will be provided to the parole board.

B$)$ When a contract is being draft, if something was agreed to verbally but the writer forgot to put it into the contract. This evidence is not admissible.

C$)$ When a contract is being drafted, if something was agreed to verbally but the writer forgot to put it into contract. This evidence is admissible but must be proved and backed up with evidence$/$witnesses$.$

D$)$ This is between a recovering criminal and their Parol Officer