An organization has set up a network with 20 subnets and Class C IP addresses. What is the correct subnet mask for this network?

An organization has set up a network with 20 subnets and Class C IP addresses. What is the correct subnet mask for this network?
A . 255.255.255.248
B . 255.255.255.224
C . 255.255.255.192
D . 255.255.255.240

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Answer: A