Installing a trusted certificate on both the client’s and server’s sides For Mutual SSL to function correctly, it is essential to install a trusted certificate on both the client and server sides. This ensures that both parties can authenticate each other, establishing a secure and verified connection. Mutual SSL relies on this two-way authentication process for enhanced security. Option A is incorrect because port forwarding is not a standard requirement for Mutual SSL configuration. Option B is incorrect as requiring administrative privileges on user devices is unrelated to Mutual SSL setup. Option D is incorrect because while configuring cipher suites is part of SSL configuration, it is not the primary requirement for Mutual SSL.