An engineer is performing the IP subnet design for an organization and needs to find the best mask that should be used. The organization has been assigned the 172.52.239.0/24 network. The addresses must be split up so that they can be equally organized into 10 subnets of at least 32 addresses. Which mask would best fit this requirement?

A) 255.255.255.240
B) 255.255.255.224
C) 255.255.255.248
D) None

D
Explanation: A) The 172.52.239.0/24 network offers up to 254 total possible host addresses; the requirements call for 320. Because of this, no mask would be able to meet these requirements.