The openssl command can be used to test connections with various secure services. What command will open a connection with a remote POP3S (POP3 over SSL) server?

The openssl connect command does not exist; s_client is the correct subcommand for this purpose.

This command incorrectly uses openssl connect and omits the s_client subcommand.

The openssl s_client command is specifically designed to implement a generic SSL/TLS client, which is used for connecting to a remote server over SSL/TLS and performing various diagnostic tasks. The connect option followed by host:port (e.g., pop.example.com:pop3s) correctly specifies the target server and service.

While openssl s_client host:port might sometimes work, the connect keyword explicitly states the intent to establish a connection, making s_client connect host:port the more precise and commonly used form for clarity and robustness.