which one of the following is a component of shield for tunneling ?

Option 3 : Cutting edge

Concept

The shield method is used for driving a tunnel through water-bearing strata.

It is an equipment that acts as a bridge with a roof for workers.

A shield is a movable frame and it is used to support the face of the tunnel.

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Components of Shield are

i) The skin

ii) Cutting edge

iii) Propelling jack

iv) The hood

v) The tail

vi) Port holes    

Linear plate and stiffeners are components of Linear plate method