Undertaking a Futile Intervention, Such as Cardiopulmonary Resuscitation (CRP), on a Patient

Undertaking a futile intervention, such as cardiopulmonary resuscitation (CRP) , on a patient that has almost no chance of recovery:

A) Is ethically unacceptable because of harm to the patient
B) Is ethically unacceptable because it is a waste of time and resources
C) Is morally required if the patient's family wants the physician to "do anything" to keep a patient alive
D) Might be justified, within limits, as an act of compassion and care for the patient's grief-stricken family