Based on networks 10.8.16.0/22 and 10.8.31.0/21, which of the following is the BEST summarized CIDR notation?

Based on networks 10.8.16.0/22 and 10.8.31.0/21, which of the following is the BEST summarized CIDR notation?
A . 10.8.0.0/16
B . 10.8.0.0/19
C . 10.8.0.0/20
D . 10.0.0.0/24

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Answer: A