A system administrator needs to verify the SSL certificate information of a web server at the domain 'example.com' running on the default HTTPS port. Which command should be used to retrieve and display the certificate details?
openssl s_client -tls1_2 -connect example.com:443
openssl s_server -connect example.com:443
openssl s_client -host example.com -port 443
openssl s_client -verify example.com
openssl s_client -connect example.com:443 -cert
openssl s_client -connect example.com:443 -showcerts