What is the function of the <sub> tag in HTML?

The _{tag in HTML is specifically designed to display text in a subscript format. This means that any text wrapped within the tag will appear lowered and smaller than the surrounding text, which is commonly used in mathematical notations, chemical formulas, and other contexts where subscripts are appropriate. For instance, in the chemical formula for water, H₂O, the "2" is typically represented in subscript to indicate that there are two hydrogen atoms.}

The other choices refer to different HTML functionalities. The tag is used for italic formatting, the tag is used for bold text, and the tag is utilized to create hyperlinks. Each of these tags serves its own distinct purpose, making the _{tag unique in its capacity to represent subscript text, which is vital for accurately presenting certain types of information.}