An advocate has duties to the court, to the client, to the opponent, and to the profession.
\[\begin{array}{rl} \bullet & \text{Options (D), (B), and (C) are duties towards the court, aimed at maintaining the dignity of the court and preventing conflicts of interest. These are outlined in the Bar Council of India Rules (e.g., Rule 1 on dignity, Rule 6 on not appearing before relatives).} \\ \bullet & \text{Option (A), not committing a breach of Section 126 of the Evidence Act, refers to protecting privileged professional communications. This is a fundamental duty an advocate owes to their **client**, not directly to the court. While a breach of this duty could lead to professional misconduct proceedings, its primary obligation is towards the client's confidentiality.} \\ \end{array}\]