Which statement explains the purpose of dynamic placeholders?

This answer is based on the Sitecore documentation of dynamic placeholders1. Dynamic placeholders are an extension of the regular Sitecore placeholders that allow you to add the same placeholder name several times across multiple renderings, and even within the same rendering. Dynamic placeholders generate a unique key for each placeholder instance, which ensures that the content within the placeholder is unique and not duplicated. Dynamic placeholders also enable you to build functionality that generates multiple placeholders within the same rendering dynamically. For example, you can use dynamic placeholders to create a tab component that can have any number of tabs, each with its own content. References:

Dynamic placeholders

Sitecore dynamic placeholders and JSS

Walkthrough: Configure your components to use dynamic placeholders