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?

There is no `openssl connect` subcommand; `s_client` is the correct utility for establishing SSL/TLS connections.

There is no `openssl connect` subcommand.

The `openssl s_client` command is the standard utility for acting as an SSL/TLS client, allowing users to initiate a secure connection to a remote host and observe the TLS handshake details. In this context, `connect pop.example.com:pop3s` explicitly specifies the target host and port for the secure connection, making it suitable for testing POP3S (POP3 over SSL/TLS).

While `openssl s_client pop.example.com:pop3s` is a functional command, option C explicitly uses the `connect` keyword to specify the target, which might be considered the more precise or formally correct way to invoke the connection action for `s_client` in some contexts.