We have a project

$($

RedBird

$)$

$,$

$$with these activities in days: Activity A with duration

$4$

$$and no precedents. Activity B with duration

$1$

$5$

$$and predecessor. A

$,$

$$Activity C with duration

$1$

$$and predecessor. A

$,$

$$Activity D with duration

$1$

$$and predecessor B

$,$

$$Activity E has duration

$9$

$$and predecessors B and C

$,$

$$Activity F has duration

$2$

$$and predecessor D

$,$

$$and Activity G has duration

$1$

$7$

$$and predecessors of E and F

$.$

$$From question #

$1$

$,$

$$what is the slack in node EF

$?$