Where can an administrator specify the notification action to be taken by the firewall in the event that available disk space drops below 15%?

Where can an administrator specify the notification action to be taken by the firewall in the event that available disk space drops below 15%?

A.
Real Time Monitor > Gateway Settings > Status Monitor

B.
SmartView Tracker > Audit Tab > Gateway Counters

C.
This can only be monitored by a user-defined script.

D.
SmartView Monitor > Gateway Status > Threshold Settings