Answer:
A) disclose to the seller that he has a license and inform his broker of the transaction
Step-by-step explanation:
Even though Sam is trying to purchase the property for himself, he must still inform the seller about his broker status. It probably wouldn't affect the sale in any way, but the obligation to disclose the information exists.
The same applies to Sam's broker, even though the transaction will not generate any commission, he still has to inform about it.