Which of the following sshd configuration should be set to no in order to fully...

To fully disable password based logins for SSH, you need to set both Challenge Response Authentication and Password Authentication to no in the sshd configuration file. These options control whether the server will accept password-based authentication methods such as keyboard-interactive or PAM. Setting them to no will only allow public key authentication or other methods that do not involve passwords. References:

LPIC-2 Exam 202 Objectives1

LPIC-2 Exam 202 Study Guide2

LPIC-2 Exam 202 Topic 208: SSH Configuration3