Which of the following conditions must be met in order for a web browser to trust a web server certificate signed by a third-party CA?

A. The public key of the web server certificate must be installed on the browser.
B. The web-server certificate must be installed on the browser.

C. The CA certificate that signed the web-server certificate must be installed on the browser.

D. The private key of the CA certificate that signed the browser certificate must be installed on the browser.