Which of the following is NOT a valid HTML tag for table elements?

The tag "" is not a valid HTML tag for table elements. In HTML, the correct tags for constructing tables include "" for table rows, "" for table data (cells), and "" for table headers. The "" tag specifically denotes a row within a table, while "" and "" provide the structure for the data and headers within those rows. Since "" does not exist in the HTML specification for table structures, it is the only option that is incorrect among the choices given. Understanding this distinction is essential when working with HTML tables, as using the correct tags ensures proper data representation and accessibility on web pages.