$\backslash$table$[[$Job$,\backslash$table$[[$Center$],[$ hrs $)]],\backslash$table$[[$Center $2],[($hrs$)]]],[$A$,10,2],[$B$,5,4],[$C$,7,5],[$D$,3,6],[$E$,1,7]]$

$9$

points

$801$:$33$:$46$

Using Johnson's rule, what is the idle time at Center $2?$

Multiple Choice

$0$

$1$

$3$

$4$

$6$