​Which of the Following Statement(s)is/are True

​Which of the following statement(s) is/are true?

A) ​When a patient is covered by an indemnity-type plan,most practices will file the claim with the insurance company on the patient's behalf.
B) ​When a patient is covered by an HMO,the provider's office files the claim with the insurance company on the patient's behalf.
C) ​Providers and suppliers are not required to file the Medicare claim if the service is not covered by Medicare unless the service is provided on an assigned basis and the beneficiary requests the provider to submit the claim
D) ​All of the above