To increase the font size on all field placeholder value components specifically to aid visually impaired users, applying global styling changes is the most effective approach. Among the options provided, adding a new theme text entry to the application theme allows for targeted styling adjustments to be applied broadly across the application.
* C. Add a new theme text entry to the application theme: This approach allows for the customization of specific UI elements, such as field placeholder values, at the application level. By adding a new text entry with increased font size to the application theme, all instances of field placeholder values throughout the application will inherit this styling, ensuring a consistent and accessible user experience for visually impaired users.
Updating the existing Default theme text entry (A) could affect more elements than intended. Running a case type and changing the font on the view (B) only applies changes locally and lacks scalability. Uploading a new application theme (D) could be an option but is less direct and more complex than simply adding a new text entry specifically for placeholder values.