Which of the following is a requirement when counseling clients in groups?

The correct choice focuses on the importance of maintaining clear and accurate documentation when working with clients in a group counseling setting. Clarifying the treatment unit in written records ensures that each member's progress, issues, and the dynamic of the group are well understood and properly documented. This thorough documentation is essential for tracking the therapeutic process, understanding group interactions, and ensuring that confidentiality and ethical standards are upheld. Clear records can also help facilitate communication amongst therapists or professionals involved in the group's management and support, ensuring a cohesive approach to treatment.

The other options do not align with best practices in group counseling. Assuming everyone is aware of each other's issues undermines the confidentiality and trust that is crucial for an effective group dynamic. Encouraging members to discuss personal details outside of sessions could lead to breaches of confidentiality, which should be strictly maintained in a group setting. Normalizing competitive behavior among members can disrupt the supportive environment necessary for healing and personal growth, which can be detrimental to group cohesion and individual progress.