Your company owns the public Internet IP address range of 131.107.20.0 to 131.107.20.255.
You need to create a subnet that supports four hosts. The solution must minimize the number of addresses
available to the subnet.
Which subnet should you use?

A.
131.107.20.16/28

B.
131.107.20.16/30

C.
131.107.20.0/29

D.
131.107.20.0 with subnet mask 255.255.255.224

Explanation:
http://jodies.de/ipcalc?host=131.107.20.0&mask1=29&mask2=