What action can be taken?

Revoking the RCIC's license is a drastic measure that eliminates their ability to practice altogether. This action does not allow for an opportunity to correct any issues and may be disproportionate to the severity of the situation, especially if the problems can be addressed through other means.

Referring the RCIC to further IRB training may be beneficial, but it does not directly address any immediate concerns regarding their license. This action might be appropriate as a supplementary measure, but it does not provide the level of oversight or consequence that a suspension or restriction would offer in response to potential misconduct or incompetence.

Settling the matter between the RCIC and the client does not address systemic issues that may exist with the RCIC's practices. While resolution between the parties is important, it does not ensure that any underlying problems are resolved or that the RCIC's license is appropriately managed in light of potential violations.