Consider the network shown to the right.

$($a$)$ Find a spanning tree of the network.

$($b$)$ Calculate the redundancy of the network.

$($c$)$ What is the diameter of the network?

$($a$)$ Which of the following is a spanning tree of the given network?

A$.$ B$.$ C$.$

D$.$

$($b$)$ The redundancy of the network is $R=$

$($Type a whole number.$)$

$($c$)$ The diameter of the network is $$

$($Type a whole number.$)$