What happens by default if the Log Partition Monitor’s high-water mark is exceeded?

A.
An alert is sent to RTMT Alert Central and log files are purged until the low-water mark is reached.

B.
An e-mail alert is sent to the administrator and logs are purged, starting with those in the inactive partition and followed by the oldest files in the active partition, until the low-water mark is reached.

C.
An alarm message is sent to the syslog, an alert is generated in RTMT Alert Central, and log files are purged until the low-water mark is reached.
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Cisco 642-447 Exam

D.
An e-mail alert is sent to alert the administrator and the system starts to purge log files starting with the oldest first.

Explanation:

Cisco Unified Communications Manager Real-Time Monitoring Tool Administration Guide LogPartitionHighWaterMarkExceeded (% disk space)
If the percentage of disk usage is above the high water mark that you configured, the system sends an alarm message to syslog, generates a corresponding alert in RTMT Alert Central, and automatically purges log files until the value reaches the low water mark.