During a passive reconnaissance mission, you discover that the secure communication certificate used by the target organization's web server has been invalidated. Which option should you choose to most authoritatively confirm the current status of this certificate?
Inspect the browser's security panel while accessing the website for any security warnings.
Conduct a WHOIS domain lookup to see if there is any mention of certificate invalidation.
Employ an automated scanning tool to analyze the server's encryption protocols and identify any invalidations.
Use the Online Certificate Status Protocol (OCSP) to verify the current status directly from the issuing authority.