What restriction is placed on ASET's legal counsel during hearings?

The correct answer highlights that ASET's legal counsel cannot present evidence or argue on behalf of another ASET entity. This restriction is fundamental to maintaining impartiality and integrity within the hearing process. By not allowing legal counsel to take on multiple roles or advocate for different parties within the same context, the hearings can focus more clearly on the specific issues at hand rather than being influenced by competing interests. This ensures that the proceedings remain fair and just for all parties involved.

The other options do not accurately reflect the role of legal counsel or the structure of the hearings. For instance, legal counsel may indeed provide advice to boards or committees where appropriate, lead the hearing in certain circumstances, and be involved in multiple cases as long as they adhere to their designated responsibilities. This highlights the checks and balances that are crucial to uphold the fairness and effectiveness of the legal processes within ASET.