Which of the Following Is NOT One of the Tips

Which of the following is NOT one of the tips for effectively using computers in sales presentations?

A) Be prepared by having backup batteries, adapters, disks, or CDs
B) Make sure both you and the customer can comfortably view the output
C) To avoid embarrassing downtime when systems crash, have your technical support team on call when you are making presentations
D) Really get to know your software
E) Make sure your audience has ample opportunity to ask questions