Question $21(1$ point$)$

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A project is consist of $5$ activities. The durations and interdependencies of the activities are shown in the following table. What is the slack of activity B$?$

Enter your answer in the box as a whole number. For example, if your answer is days, enter the number $2$ in the box.

$\backslash$table$[[,$Duration,Immediate predecessor$],[$A$,10$ days,$-],[$B$,9$ days,$-],[$C$,6$ days,$-],[$D$,2$ days,A$],[$E$,3$ days,B$]]$

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