Match List I with List II and select the correct answer using the codes given in below list :

List I (Printing processes)	List II (Image carriers)
(a) Letterpress	1. PS plate
(b) Offset	2. Photo Polymer plate
(c) Gravure	3. Metal Block
(d) Flexo	4. Copper cylinder

Intaglio printing process refers to 

Specks of dust on the clear areas of the positive as on the contact frame glass causes 

The coating plated over the surface of a gravure cylinder to have easy engravability

Whenever the web stops, the gravure cylinder must continue to rotate slowly in the ink pen and called as

The angular measurement where the surface of the gravure cylinder is free of ink prior to printing