Certkiller wants to implement a scanning solution to scan double-sided documents at the most
efficient cost. They expect to scan in excess of 800 sheets per day. Which of the following solutions
will provide the best return on investment?

A.
A 20 ppm duplex scanner with ADF

B.
A 20 ppm simplex scanner with ADF

C.
A 40 ppm simplex scanner with ADF

D.
A 40 ppm duplex scanner with hand-feed