Which of the Following Are Characteristics of the Orthogonal Cutting

Which of the following are characteristics of the orthogonal cutting model (three best answers) :

A) a circular cutting edge is used
B) a multiple-cutting-edge tool is used
C) a single-point tool is used
D) only two dimensions play an active role in the analysis
E) the cutting edge is parallel to the direction of cutting speed,
F) the cutting edge is perpendicular to the direction of cutting speed,
G) the two elements of tool geometry are rake angle and relief angle