During an ongoing data session, a change of charging conditions occurs. Elastic ChargingServer (ECS) triggers a Diameter

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During an ongoing data session, a change of charging conditions occurs. Elastic ChargingServer (ECS) triggers a Diameter re-authorization request (RAR) message to the network.Which statement describes the correct flow?

A. The re-authorization request is sent to the network element as part of the next Diameter CCR-Update message.
B. ECS sends the Diameter RAR message to the Diameter Gateway, which forwards it to the network element.
C. ECS puts a message in the notification queue. The Diameter Gateway reads the message and converts it to a Diameter RAR message.
D. ECS sends the Diameter RAR message directly to the network element.