1. Programmable logic controllers (also called PLCs) are used to control machines and other
industrial applications with
instead
of using hard-wired devices.

answer; /// i believe the correct answer is (color filter);

the correct option is (d) vin label

vin stands for vehicle information number. this is a thin metallic plate attached to the engine of the vehicle and it includes all the important information which are related to the vehicle. it also provides the information whether the vehicle has been stolen or not because the replacement and alternation of vin number creates difference in the exact number printed on the vin and carved on the engine.