What must they monitor to have visibility on the potential performance impact due to the constantly increasing number of spoke sites?

Company A has a hub-and spoke topology over an SP-managed infrastructure. To measure traffic performance metrics. IP SLA senders on all spoke CE routers and an IP SLA responder on the hub CE router.

What must they monitor to have visibility on the potential performance impact due to the constantly increasing number of spoke sites?
A . memory usage on the hub router
B . interface buffers on the hub and spoke routers
C . CPU and memory usage on the spoke routers
D . CPU usage on the hub router

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Answer: D