What could be the reason for the SNMP alert failure?

Scenario: A Citrix Administrator is configuring SNMP management on the NetScaler to receive alerts when something fails. The administrator was confident that the Manager, Alarms and SNMP Traps were configured correctly. The following week, there was a NetScaler-related outage and the administrator did NOT get any alerts.

What could be the reason for the SNMP alert failure?
A . The Community Name was NOT configured on the NetScaler SNMP Trap Destination settings.
B . The NetScaler only has Standard licensing.
C . The NetScaler is configured for SNMP version 1.
D . The NetScaler Application Firewall is blocking the alerts from going out.

Answer: A