$\backslash$table$[[$Job$,$Processing Time $($hrs$),$Hours Until Due$],[$V$,3,5],[x,1,1],[$Y$,4,9],[$Z$,2,3]]$

If Eva uses the shortest processing time first $($SPT$)$ priority rule to schedule these jobs, what will be the average completion time?

$($A$)8$ hours

$3$ hours

$7$ hours

$($D$)7\mathrm{.}2$ hours

$($E$)5$ hours