Which HTML tag is used to define inserted text?

The tag that is used to define inserted text is the tag. This tag is specifically designed to mark up text that has been added or inserted into a document. It visually indicates changes in content, making it particularly useful in collaborative environments such as editing documents or maintaining version histories.

When the tag is applied, browsers typically render the inserted text with an underline, highlighting it as new content. Additionally, the tag can also include the "cite" attribute to indicate the source of the insertion or the "date" attribute to show when the insertion took place.

In contrast, the other options do not represent standard HTML tags recognized by web browsers for indicating inserted text, which is why they are not suitable choices.