Refer to the exhibit.

The enterprise has decided to use the network address 172.16.0.0. The network administrator
needs to design a classful addressing scheme to accommodate the three subnets, with 30, 40,

and 50 hosts, as shown. What subnet mask would accommodate this network?

A.
255.255.255.192

B.
255.255.255.224

C.
255.255.255.240

D.
255.255.255.248

E.
255.255.255.252

Explanation:
Subnet mask A i.e. 255.255.255.192 with CIDR of /26 which means 64 hosts per
subnet which are sufficient to accommodate even the largest subnet of 50 hosts.