The question describes a scenario where a team needs to create a Vertex AI Workbench environment with restricted access. The correct approach is to create a new service account with the Vertex AI User role, assign Service Account User roles to team members, and then use this service account to provision a user-managed notebook instance.
Option C is the correct solution because it prioritizes security by creating a dedicated service account and granularly assigning roles to ensure team members only have necessary access, preventing unauthorized access to sensitive resources. This method adheres to best practices for secure cloud collaboration.