QUESTION $20$

Using the assembly$-$line balancing procedures for any assembly$-$line balancing problem, which of the following is most correct?

The theoretical minimum number of workstations is always less than or equal to number of workstations actually used.

The theoretical minimum number of workstations is always less than number of workstations actually used.

The theoretical minimum number of workstations is sometimes more than number of workstations actually used.

The theoretical minimum number of workstations is sometimes less than $Y$ and sometimes more than number of workstations actually used.

The theoretical minimum number of workstations is never less than number of workstations actually used.