The IP address space of 220.127.116.11/24 has been allocated for all devices on this network. All devices must use the same subnet mask and all subnets are usable.
There is a picture showing 3 switchs connected to a router. One switch has 16 users connected to it, one has 32 users connected to it, and the last has 58 users connected to it.
Which subnet mask is required to apply the allocated address space to the configuration that is shown?
It says the answer is D, but I think the answer is B. What is the correct answer, and why is that answer correct?