Given the following information, what is the slack time for activity C$?$

$\backslash$table$[[$Activity$,$Immediate Predecessor$($s$),$Time $($days$)],[$A$,-,2],[$B$,-,5],[$C$,-,1],[$D$,$B$,10],[$E$,$A$,$ D$,3],[$F$,$C$,6],[$G$,$E$,$ F$,8]]$

$11$

$12$

$7$

$10$