Assume you$$re a network administrator and you$$ve been given the network number

$243\mathrm{.}17\mathrm{.}19\mathrm{.}0$ and you set up your network using the netmask $255\mathrm{.}255\mathrm{.}255\mathrm{.}0.$ Why would

you never assign a host the IP address $243\mathrm{.}17\mathrm{.}19\mathrm{.}255?$

a$)$ This is reserved to describe the entire network.

b$)$ This is used for broadcasts.

c$)255$ is invalid because the host numbers only range from $0-100$

d$)$ None of the above