Anju Chaudhary is developing a program in supply chain management certification for managers. She has listed a number of activities that must be completed before a training program of this nature could be conducted. The$$ activities, immediate$$ predecessors, and times appear in the accompanying table. Activity Immediate Predecessor$($s$)$ Time $($days$)$

A $-10$

B $-6$

C $-3$

D B $2$

E A$,$ D $3$

F C $5$

G E$,$ F $12$

Slack time for each of the activities$$ is: