What is needed to ensure text accessibility through Unicode?

To ensure text accessibility through Unicode, the essential requirement is that the text must be mapped to Unicode. Unicode is a standardized character encoding system that allows for consistent representation of text across different systems and languages. By mapping the text to Unicode, it ensures that characters, symbols, and scripts are represented uniformly, making it possible for diverse platforms and software to interpret and display the text correctly.

This mapping is particularly critical for accommodating the vast range of characters used in different languages, as well as special symbols and emojis. When text is properly encoded in Unicode, it becomes accessible not just for reading and printing, but also for screen readers and other assistive technologies which rely on consistent character representation to convey meaning to users with disabilities.

The other options mentioned do not directly contribute to the accessibility of text through Unicode. For instance, printing text in bold does not affect its Unicode mapping, and providing text in multiple languages or audio format serves different purposes in accessibility but does not impact the necessity of Unicode mapping for ensuring that text is universally readable across various platforms.