Which of the following professionals is following one of the guidelines for effective slide presentations?

a. Shay turns off the lights in the room so his slides will be easier for the audience to see.
b. Teri explains why the information on each slide is important.
c. Heather looks at her slides during most of the presentaton.
d. Ellis does not introduce the slides but just starts them without comment.
e. Pedro displays photographs on the screen whenever he speaks for lengthy periods without referencing his slides.