A user reports that while attempting to access a secure website known to be safe, a warning message appears stating that the site's security certificate is not trusted. Upon investigating, you confirm the site's certificate is valid and should be trusted. What is the BEST course of action to resolve this issue?
Install third-party root certificates manually to the user's browser.
Disable security certificate warnings in the browser settings.
Contact the website administrator to have the security certificate reissued.
Update the browser or operating system to the latest version.