CompTIA Security+ Question A-63

Which of the following would the security engineer set as the subnet mask for the servers below to utilize host addresses on separate broadcast domains?
Server 1: 192.168.100.6
Server 2: 192.168.100.9
Server 3: 192.169.100.20

A. /24
B. /27
C. /28
D. /29
E. /30

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