The Network Administrator Notices That the Hourly Plot of a Router's

The network administrator notices that the hourly plot of a router's data traffic varies from hour to hour.What does this information tell the network administrator?

A) This is most likely normal operation.
B) The network administrator needs to compare this hourly plot with expected hourly plots of the router's data traffic.
C) The network administrator should run diagnostics on the router, and the most likely problem is someone is trying to break into the system.
D) The router needs to be rebooted.