$($c$)(20$ Points$)$ Consider the topology shown in Figure $1.$ Denote the three subnets with hosts $($starting clockwise at $12$:$00)$ as Networks A$,$ B$,$ and C$.$ Denote the subnets without hosts as Networks D$,$ E$,$ and F$.$

Assign network address to each of these six subnets, with the following constrainsts: All addresses must be allocated from $214\mathrm{.}96\mathrm{.}16/22$; Subnet A should have enough addresses to support $500$ interfaces; Subnet B should have enough address to support $250$ interfaces; and Subnet C should have enough addresses to support $250$ interfaces. Of course, subnet D$,$ E and F should each be able to support two interfaces. For each subnet, the assignment should take the form a$.$b$.$c$.$d$/$x or a$.$b$.$c$.$d$/$x$-$e$.$f$.$g$.$h$/$y$($exclude the range represented by $"$e$.$f$.$g$.$h$/$y$"$ from the subnet specified by $"$a$.$b$.$c$.$d$/$x$").$

$1$