Final answer:
Gabriella should change the printer settings to grayscale for optimal black and white printing on a printer that does not print in color. This approach ensures better detail and legibility of her printed slides compared to printing without any color adjustments.
Step-by-step explanation:
If Gabriella plans to print her slides on a printer that does not print in color, she should change the printer settings to grayscale. This action will ensure that the slides are printed in variations of black and white, which can provide a clearer representation of the slides than if they were printed with color settings on a non-color printer. Converting the slides to black and white could also be an option, depending on the software she's using, but changing to grayscale is often the recommended approach as it maintains details that might be lost in a pure black and white conversion. Using a different printer that prints in color is not a necessary action unless color reproduction is crucial for her presentation. Printing the slides as they are, without any changes, could result in poor legibility and quality since the printer cannot produce the intended colors.