Which of the following does the routing prefix meet the requirement of IP-Prefix? (Multiple Choice)

Which of the following does the routing prefix meet the requirement of IP-Prefix? (Multiple Choice)

A . 20.0.1.0/23
B . 20.0.1.0/24
C . 20.0.1.0/25
D . 20.0.1.0/28

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Answer: BCD