单选题On the topic of VLSM, which one of the following statements best describes the concept of the route aggregation?（）ADeleting unusable addresses through the creation of many subnets.BCombining routes to multiple networks into one supernet.CReclaiming unused space by means of changing the subnet size.DCalculating the available host addresses in the AS.
单选题
On the topic of VLSM, which one of the following statements best describes the concept of the route aggregation?（）
A
Deleting unusable addresses through the creation of many subnets.
B
Combining routes to multiple networks into one supernet.
C
Reclaiming unused space by means of changing the subnet size.
D
Calculating the available host addresses in the AS.
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