An engineer is trying to add a new subscriber to the cluster of Cisco UCM, and the synchronization is failing. The engineer obtained the output from the publisher and noticed the error. Based on the output, what is the issue?

- The NTP server is running out of space in the hard drive, which prevents the cluster service from starting.
- The NTP service is pointing to the wrong publisher.
- The NTP server must be replaced by another server with NTP stratum 1, 2, or 3 running version NTPv4.
- The NTP server for Cisco UCM must be stratum 6 or higher.
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