Question

Which form of Intaglio is one of the oldest and most difficult to work with?

Answer 1

Which form of Intaglio is one of the oldest and most difficult to work with?

a.

engraving

Answer 2

Answer - A. Engraving 

Simple Explanation Reason - Why it was difficult is because of learning the technique. Since it was less common then Printmaking used with etching. 

Credit Researched - Engraving - Wiki-Pedia