What is the difference between active and passive euthanasia?

AIn active euthanasia, the doctor knowingly witholds life-saving medication. In passive euthanasia, the doctor kills the patient.
BIn active euthanasia, the patient kills himself. In passive euthanasia, the doctor performs the final action.
CIn active euthanasia, the patient is accompanied by two witnesses. In passive euthanasia, the patient has no witnesses other than the doctor.
DIn active euthanasia the doctor takes proactive steps to end the life of the patient. In passive euthanasia the doctor witholds life-saving treatment.

Verified Answer :

I think it has something to do with moral. Like, active euthanasia is when the medical personnel do something to make the patient deliberately die, and passive euthanasia is when they don't do something to keep the patient alive.