Which Statement(s) Are Correct About the DOE Factorial Plot Output

Which statement(s) are correct about the DOE Factorial plot output here? (Note: There are 3 correct answers) .

A) Two factors were operated at 3 levels each
B) The highest tool age was achieved with metal hardness at high level while keeping the cutting speed at the low level
C) The design indicated above is a 32 factorial design
D) The cutting speed and cutting angle are at the low level for the least tool age achieved
E) All factors had 2 levels in the experiment

Correct Answer:

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