Which option is the minimum summary range to cover the existing WAN sites while also allowing for three additional WAN sites of the same size, for future growth?

Refer to the exhibit. An engineer must apply IP addressing to five new WAN sites and choses the new subnets pictured. The previous administrator applied the addressing at Headquarters.

Which option is the minimum summary range to cover the existing WAN sites while also allowing for three additional WAN sites of the same size, for future growth?

A . 10.0.60.0/18
B . 10.0.64.0/21
C . 10.0.64.0/17
D . 10.0.0.0/17
E . 10.0.64.0/18

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Answer: E