These items describe guidelines for the effective use of presentation graphics. Graphics should be large enough to be seen by th
e audience. Graphics should be used on every slide. Graphics should be used to make a boring presentation interesting. Graphics should be used when they are relevant to the content.
It's not mandatory to use graphics in every slide. To make a boring presentation interesting, it's not the only option to include graphics but there are other alternatives. Last and the first options seem to be more correct.
