Question

to uphold ethical principles, when should the decision to withdraw life support be made?
prior to any mention of organ donation
as soon as the physician deems it necessary
prior to exhausting all other treatment options
while the patient can still author an advance directive

Explanation:

To avoid any conflict of interest and uphold ethical standards, the decision to withdraw life - support should be made independently of organ donation considerations. Mention of organ donation should not influence the life - support withdrawal decision.

Answer:

Prior to any mention of organ donation