I believe the answer is abstract
Answer: I believe it is tracing!
Explanation:
I am not One Hundred Percent sure, but I am led to believe as such as it still provides a guideline for the pencil to follow, though not hard edged and focuses more on the stability of your hand and your precision.
Answer:
A. adding metallic oxides to sand and ash or lime, then infusing at high temperatures
Explanation: