Never Discussing a Client's Case in a Common Area (Such

Never discussing a client's case in a common area (such as a hallway, an elevator, a cafeteria, or a restaurant) where a conversation might be overheard is a rule of thumb to follow to avoid which of the following?

A) Violating the duty of competence
B) Violating the duty to avoid conflicts of interest
C) Violating the rule of client confidentiality
D) Violating the duty of competence and violating the duty to avoid conflicts of interest