What could be a possible cause of the high CPU usage?

While troubleshooting high CPU usage on cores 3 and 4 on a cluster, you notice the following output of fwaccel stats -s:

What could be a possible cause of the high CPU usage?
A. Connections are being partially accelerated by SecureXL, but too many packets are still being processed by the firewall kernel.
B. The Secure Network Dispatcher (SND) is having to process too much inbound traffic from the NICs.
C. Connections are not being accelerated by SecureXL, and all packets are being forwarded to firewall kernel instances for inspection.
D. The Secure Network Dispatcher (SND) is working too hard to distribute the traffic to the acceleration layer.

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