A. all possible levels of output.
B. all levels of output greater than or equal to 40.
C. 10 to 30 units of output.
D. 30 to 60 units of output.
B. all levels of output greater than or equal to 40.
C. 10 to 30 units of output.
D. 30 to 60 units of output.
answer:
c