An administrator is installing an SSL certificate on a new system. During testing, errors indicate that the certificate is not trusted. The administrator has verified with the issuing CA and has validated the private key. Which of the following should the administrator check for next?

A wildcard certificate allows for the securing of multiple subdomains under a single domain. However, if the certificate being tested is not a wildcard certificate, checking its configuration would not be relevant to the trust issues at hand. The administrator's focus should be on the root certificate's presence rather than the type of certificate configuration.

The certificate signing request (CSR) is used to initiate the SSL certificate issuance process. Since the administrator has already validated the private key and verified with the issuing CA, the CSR's validity is not the next logical step. The presence of a trusted root certificate is far more critical in this context.

While the public key is essential for the SSL certificate's functionality, if the certificate is not recognized as trusted, the issue likely lies with the root certificate rather than the public key configuration. Confirming the public key's setup would not address the trust error being experienced.