Answer:
(b) by changing the font size and color
Explanation:
Adding action buttons cannot be an enhancement to a poster. A poster is a static form of image not a dynamic or transitional form of the same. So adding action buttons will be extremely off point.
Filtering cells is not an option either to enhance the appearance of a poster. Cells are filtered in spreadsheet applications (such as MS Excel) to select or find a range of data in one or more columns in the cell. So this is not applicable to poster images.
Slide transitions are used in applications such as MS PowerPoint to create transitions in documents. Since transitions are not necessary in posters, this is not an option.
The only option, among other options, to enhance the appearance of a poster is by changing the font size and color. Changing these will give the poster a new look depending on how skillful the user is.
