RES exam question on Ethics & Professional Conduct: duties that Samantha owes to her buyer client

Samantha is a registered salesperson acting exclusively as a buyer's agent for a client purchasing a private apartment. Consider the following duties: (i) Negotiate the lowest possible price and best terms on the client's behalf. (ii) Disclose to the client all material facts about the property that Samantha knows or ought to know. (iii) Keep the client's maximum budget strictly confidential and not reveal it to the seller or seller's agent. (iv) Advise the client on the significance of clauses in the Option to Purchase before the client signs. Which of these statements correctly describe duties that Samantha owes to her buyer client?

1. A(i) and (ii) only
2. B(i), (ii) and (iii) only
3. C(ii), (iii) and (iv) only
4. D(i), (ii), (iii) and (iv)