Sophie, the CFO of Slalom Ski Supplies, received an expensive watch from one of her company's vendors congratulating her on Slalom's recent merger with another company. Which threat, if any, to her compliance with the Integrity and Objectivity Rule would accepting this gift create?

a) Undue indulgence threat.

b) No threat would be created.

c) Self-review threat.

d) Self-interest threat.