A three station work cell is illustrated in the image above. A unit needs to be processed at either Machine A or Machine B for Station $1($parallel lines, both lines doing the exact same thing$).$ The unit is then processed at Stations $2$ and $3$ before leaving the work cell. The process time of each machine$/$station is indicated in the flowchart. Specify the bottleneck$($s$).$

Note:

$1-$ These are checkboxes, you can select more than one option if required.

Question $4$ options:

Station $1$ Machine A

Station $1$ Machine B

Station $2$

Station $3$