Which of these options is a key component of a style guide?

A style guide is a crucial document in any design process, serving as a reference that outlines the visual and stylistic standards for a brand or project. Among the components included in a style guide, typography choices and color palettes stand out as vital elements.

Typography choices define the font styles, sizes, and treatments that convey the intended tone and voice of the design. This helps ensure consistency across various materials, whether in print or digital formats. Color palettes serve a similar purpose, providing a specific set of colors that align with the brand identity. These colors evoke particular emotions and reinforce brand recognition. When both typography and color palettes are consistently applied, they help create a cohesive visual experience for the audience.

Other options, such as digital file formats, print quality measures, and historical design trends, while relevant in their contexts, do not form the core components of a style guide. They may offer useful information or guidelines but do not directly contribute to the immediate visual identity and branding standards that typography and color palettes establish.