When perform line balancing on the network below, assuming CT of $30$ minutes and using the $$the most followers rule then longest time,$\text{'}$ what should be the total idle time? The network is given below with the time duration of each activity written in minutes above each respective task.

Question $16$Select one:

a$.$

$3$

b$.$

$7$

c$.$

None of the answers

d$.$

$2$

e$.$

$6$