During a penetration test, you have determined that the SSL certificates used on a company's web server are self-signed and have been expired for 6 months. What would be the most appropriate recommendation to include in your report to improve their certificate management practices?
Implement a web application firewall (WAF) to secure the server and mitigate the need for a trusted certificate.
Renew the self-signed certificates to extend their validity period so that users no longer receive security warnings.
Replace self-signed certificates with certificates issued by a trusted Certificate Authority (CA), and implement a process to check and renew certificates before they expire.
Request an exception from browsers' certificate warning lists to avoid security warnings about the self-signed certificates.