The Junos CLI help syslog command provides detailed textual explanations for individual system log (syslog) error messages, allowing an administrator to understand the cause and possible remediation of each message. No other help sub-command supplies the MOTD, hyperlinks, or URL-only output; therefore, option D is the only correct choice.

A. help reference shows the syntax and brief description of a command, not just a URL.

B. The message of the day is displayed automatically at login, not obtained with any help command.

C. Junos help commands display text; they do not output interactive hyperlinks for remediation actions.

1. Junos OS CLI User Guide, “Requesting Explanations of System Log Messages,” Section 5.5, p. 120–121 (Juniper Networks, 2023-06-30).

2. Junos OS Documentation, KB21103 “Using ‘help syslog’ to interpret messages,” ¶2–3 (Juniper, 2022).