A bar stop is to be set to control the length of identical components machined on a single spindle automatic lathe. Which one of the following is to be taken as reference for setting the bar stop ?

The dead length collet front face

The parting off tool side face towards right of the operator

The parting off tool Side face towards left, of the operator

The Centre of the parting off tool shank

Bar loading

Bar feeding

Coolant circulation

Collet opening and closing

3,4,5

3,6,9

4,6,7

4,6,8

the number of toolings

the number of spindles on the machine

the range of speeds and feeds

the design of the cams controlling the slide movements