Which of the following is a configuration file for SSH daemon settings?

The configuration file for SSH daemon settings is indeed located at /etc/ssh/sshd_config. This file is critical because it contains various settings that dictate the behavior of the SSH daemon (sshd), including parameters for authentication methods, allowed user groups, port numbers, and connection timeouts, among others. Any changes made to this file require the SSH daemon to be reloaded or restarted for the changes to take effect.

The other options listed are not correct for different reasons. The /etc/ssh/ssh_config file, for instance, is used for configuring SSH client settings rather than the daemon itself. The paths /var/ssh/sshd_config and /run/sshd/sshd_config do not align with standard practices for SSH configuration files. Typically, essential configuration files for system services like SSH are stored in the /etc/ directory, specifically under the /etc/ssh/ directory for SSH-related configurations.