Which scenario would allow a lawyer to ethically represent opposing parties in a case?

A lawyer can ethically represent opposing parties in a case under specific conditions that protect the interests and rights of both clients. Informed consent is a critical component in this situation. The lawyer must disclose all relevant information about the potential conflicts that may arise from representing both parties and ensure that they understand the implications of that decision.

When both clients provide informed consent, they acknowledge the potential risks and agree to proceed with the representation despite those risks. This consent must be given voluntarily and based on a clear understanding of the situation, indicating that both parties are aware of the possible conflicts and have made an informed choice.

It's important to note that without informed consent or if there are adverse effects that could detrimentally impact either party’s interests, a lawyer cannot take on such dual representation. This principle upholds the duty of loyalty and the obligation to advocate effectively for each client's best interests, which could be compromised if conflicts are not properly managed.