Final answer:
The correct notation for a medication prescribed to be taken once daily in the morning is 'q.d.', standing for 'quaque die', which means 'every day' in Latin.
Step-by-step explanation:
When a physician orders a medication to be taken once per day in the morning, it is typically noted as q.d. The abbreviation q.d. stands for quaque die, which is Latin for 'every day'. This is to be differentiated from q.d.a.m., which is not a commonly used abbreviation, and o.a.m., which is also not standard. Therefore, the correct notation for a medication that is to be administered every morning is simply q.d. with the understanding that it should be taken in the morning.