What is a purpose of an SSH host key?

What is a purpose of an SSH host key?
A . It must be sent by any SSH client in addition to a user key in order to identify the client’s host.
B . It provides the server’s identity information to connecting SSH clients.
C . It is the root key by which all user SSH keys must be signed.
D . It authenticates any user that logs into a remote machine from the key’s host.
E . It is used by system services like cron, syslog or a backup job to automatically connect to remote hosts.

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Answer: B