Chapter 8, Problem 13TC

Which two of the following hosts on a corporate intranet are on the same subnet?

$\begin{array}{l}\text{a}\text{. 192}\text{.168}\text{.2}\text{.143 255}\text{.255}\text{.255}\text{.0}\hfill \\ \text{b}\text{. 172}\text{.54}\text{.98}\text{.3 255}\text{.255}\text{.0}\text{.0}\hfill \\ \text{c}\text{. 192}\text{.168}\text{.5}\text{.57 255}\text{.255}\text{.255}\text{.0}\hfill \\ \text{d}\text{. 172}\text{.54}\text{.72}\text{.89 255}\text{.255}\text{.0}\text{.0}\hfill \end{array}$