Malvine manages manuscripts and has developed a CPM analysis of her current one. Sadly, she spilled soda on her output and washed away most of the entries in the table. Activity Pred Time ES EF LS LF Slack A -- 10 0 B -- 6 C B 22 D A, B 22 E D 3 F D 22 G C, E, F 5 32 What is the duration of activity C? a. 7 b. 9 c. 8 d. 10