Which of the following indicates that a station is listening on a repeater and looking for a contact?

The statement "The station's call sign followed by the word 'monitoring'" is a clear and standard way for a station to indicate that it is actively listening on a repeater and awaiting communication from others. By including their call sign followed by "monitoring," the operator effectively communicates their intention to other users on the repeater that they are available and ready to make contacts.

This protocol is especially useful in repeater use because it informs other operators that the station is listening for anyone who might want to reach out. It is straightforward and conforms to common practices in amateur radio communication, facilitating efficient operations on shared frequencies.

In contrast, mentioning "CQ CQ" followed by the repeater's call sign would typically indicate a general call for contacts rather than specifying that the station is simply listening. Meanwhile, stating the repeater's call sign followed by the station's call sign does not explicitly convey an intent to connect, and using "QSY" without clear context could imply a change of frequency rather than indicating a willingness to engage on the current frequency.