_ Measurement of the area of the indented surface is not involved in the __________ hardhes testing method.$?

_ Measurement of the area of the indented surface is not involved in t

1.	_ Measurement of the area of the indented surface is not involved in the __________ hardhes testing method.$?
A.	Vicker's
B.	Rockwell
C.	Knoop
D.	Brinell
Answer» C. Knoop