A network administrator repeatedly receives support calls about network issues. After investigating the issues, the administrator finds that the source NAT pool is running out of addresses.To be notified that the pool is close to exhaustion, what should the administrator configure?（）

• A、Use the pool-utilization-alarm raise-threshold under the security nat source stanza.
• B、Use a trap-group with a category of services under the SNMP stanza.
• C、Use an external script that will run a show command on the SRX Series device to see when the pool is close to exhaustion.
• D、Configure a syslog message to trigger a notification when the pool is close to exhaustion.