Which one of the following is used only for finishing and maintaining correct form of thread ?

Tap

Threading tool

Threading chaser

Tipped tool

Turning soft material

Turning ductile materials and to break the chips

Turning cast iron

Turning hardened materials

In a chuck

Between centres

Neither 'A' nor 'B'

Either 'A' or 'B'

(a) Total length of job

(b) Length on which taper is required

(c) Diameter of the job

Both 'A' and 'B'

Tailstock

Top slide

Cross slide

Saddle