An Administrator Confirmed That the Company's Public Website Keeps Presenting

Multiple Choice

An administrator confirmed that the company's public website keeps presenting a certificate warning asking whether this site should be trusted when accessing it over HTTPS. Which of the following is the MOST likely cause for this issue?

A) Private key is missing from the certificate.
B) Public key is missing from the certificate.
C) SSL certificate is not trusted by the intermediate CA.
D) SSL certificate is not issued by a trusted root CA.