Which of the following statements is correct?

The statement regarding the class selector is accurate because it highlights one of the core functionalities of CSS. The class selector is designed to apply styles to multiple elements simultaneously. By assigning the same class name to different HTML elements, a developer can ensure that all those elements share a common style, such as color, font, or layout attributes. This makes it highly efficient for maintaining consistency across a webpage.

In contrast, the span tag can be used multiple times throughout a document, not just once. The div tag is versatile and can contain other elements, making it a foundational block for structuring layouts in HTML. The ID selector, on the other hand, is intended for single-use within a page. It uniquely identifies a single element, which means it should not be reused across multiple elements on the same page, contrasting with the purpose of class selectors.