Which route summarization most efficiently reduces perceived network complexity that is composed of subnetworks ranging from 172.16.20.0/24 to 172.16.36.0/24?

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Which route summarization most efficiently reduces perceived network complexity that is composed of subnetworks ranging from 172.16.20.0/24 to 172.16.36.0/24?
A . 172.16.8.0/21
B . 172.16.8.0/19
C . 172.16.20.0/20
D . 172.16.0.0/18
E . 172.16.20.0/19

Answer: D