Given the following sequence of activities, find the activities on critical path and length of critical path.

Activity Predecessor Time $($days$)$

A $---5$

B A $2$

C A $4$

D B $5$

E B $5$

F C $5$

G E$,$F $2$

H D $3$

I G$,$H $5$

Question $3$ options:

A$-$C$-$E$-$G$-$I, $19$ days

A$-$C$-$F$-$G$-$I, $21$ days

A$-$C$-$F$-$H$-$I, $22$ days

A$-$D$-$F$-$G$-$I, $23$ day