Which of the following private IP address spaces should be used to ensure the MINIMUM number of unused IP addresses?

A network technician needs to subnet the network. The marketing department has 28 devices.

Which of the following private IP address spaces should be used to ensure the MINIMUM number of unused IP addresses?
A . Gateway: 10.10.10.1 Netmask: 255.255.255.192
B . Gateway: 172.15.18.128 Netmask: 255.255.255.224
C . Gateway: 192.168.1.97 Netmask: 255.255.255.224
D . Gateway: 224.102.113.65 Netmask: 255.255.255.192

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Answer: C