All project team members share the responsibility to enforce the rules. 1 is incorrect because this does not answer the question fully. The project manager may lead the enforcement, but the question asks who has the responsibility – and it’s the entire project team. 2 is incorrect because the project team has the responsibility. 4 is incorrect because the project team has the responsibility. It may, in some instances, be up to the project manager to escalate the issue through the project sponsor to human resources.