In contract negotiations, an entity should include which of the following type of contract language clauses in order to allow them to bill a patient directly for services in situations where the patient has consented to be treated even though the insurance plan has denied the treatment as "not medically necessary"

A$.$

Silent PPO Arrangement clause

B$.$

Reasonable Appeals Process clause

C$.$

Ability to Recover Payment clause

D$.$

Ability to be Paid for Services clause

E$.$

Retroactive Denials clause