Answer:
2/4 means 2 beats in a measure and 2/2 means cut time
Explanation:
A 2/4 time signature contains two quarter notes within a measure
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