Option C is correct because running the command gcloud projects get iam policy provides a direct and comprehensive view of all current role assignments within a GCP project, including the project owner role. This method is efficient and straightforward for identifying role holders.\n\nOption A is incorrect because Identity-Aware Proxy (IAP) is not designed for managing GCP project roles; it's used for controlling access to web applications.\n\nOption B is incorrect because Audit Logs record historical actions rather than current role assignments.\n\nOption D is incorrect because SSH keys are unrelated to IAM roles and do not provide information about role assignments.