George is preparing a PowerPoint Presentation to use with his speech about Yosemite National Park. He is unsure of what he needs to do to properly cite the sources of several images he found online in the speech. What should George do?
a. Include the source information on each PowerPoint slide that contains an image without verbally mentioning the source.
b. Include the source information on each PowerPoint slide that contains an image and also verbally mention the source.
c. Verbally cite all image sources without including source information on his PowerPoint slides.
d. Add one or two slides at the end of his PowerPoint presentation listing source information for all of the images he used in his presentation.