$(15$ pts$.)$ Part of a road network is illustrated in the right. The length

of each road segment is $5$ distance units. $($a$)$ Compute the four

candidate distances to determine the distance between the two

road segments $n_1{n}_2$ and $n_9{n}_{10}.($b$)$ Consider the two mobile nodes

A and $B.A$ is $3$ distance units from $n_1,$ and $B$ is $2$ from $n_g.$ Compute

the four candidate distances to determine the distance between $A$

and $B.$ Filling in the following two tables.

$($a$)$ Distance between $n_1{n}_2$ and $n_9{n}_{10}$ :

$($b$)$ Distance between A and B :