Which of the following is a requirement of lawyers under Rule 8.3?

Under Rule 8.3 of the ABA Model Rules of Professional Conduct, lawyers have a duty to report ethical violations by other lawyers. This rule establishes a clear obligation for attorneys to inform the appropriate authority if they know that another lawyer has committed a violation of the Rules of Professional Conduct that raises a substantial question as to that lawyer's honesty, trustworthiness, or fitness as a lawyer. The rationale behind this requirement is to maintain the integrity of the legal profession and ensure that ethical standards are upheld.

This reporting obligation serves the broader purpose of protecting clients and the public from potential harm caused by unethical conduct. By requiring lawyers to act when they witness misconduct, the rule fosters a culture of accountability and professionalism within the legal community.

Other options, while related to ethical practice, do not align with the specific requirements of Rule 8.3. For example, maintaining client confidentiality is a separate obligation outlined in Rule 1.6; avoiding public speaking engagements is not a requirement in the Model Rules; and providing pro bono services, although encouraged, is not mandatory and does not fall under Rule 8.3.