What is true of container tags and empty tags?

The correct choice highlights that container tags come in pairs and empty tags stand alone, which is fundamental to understanding HTML structure. Container tags are those that require an opening tag and a closing tag to delineate the content they enclose. For example, in HTML, the <div> tag is a container tag, necessitating both <div> and </div> for proper syntax.

On the other hand, empty tags, also known as self-closing tags, do not have any content between them and therefore do not require a closing tag. An example of an empty tag is the <br /> tag, which creates a line break without needing an accompanying closing tag. This distinction is essential for correct HTML coding, as improper use of these tags can lead to rendering issues in web browsers. Understanding the difference between these two types of tags is crucial for anyone working with HTML and web development.