What is the primary disadvantage of using the netmask of $255\mathrm{.}255\mathrm{.}0\mathrm{.}0$ with a Class B network?

a$)$ It is too complex for network administrators to configure.

b$)$ It only creates $10$ subnets.

c$)$ It limits the number of available hosts per subnet to $256.$

d$)$ It creates a large broadcast domain that can cause network congestion