A customer is complaining that all optimized connections to their internal website cause a splash screen indicating an untrusted certificate. If the users click to accept the risks and add a security exception in their browsers, it all works fine. What is a likely cause?

A. The proxy certificate in the server-side SteelHead appliance is not trusted by the client browser

B. The SteelHead Peering Certificates have expired

C. The proxy certificate on the client-side SteelHead appliance is not trusted by the client browser

D. The server-side SteelHead does not trust the server certificate

E. The server-side SteelHead appliance has not joined the Domain properly