What is a requirement when using the MODE.MULT function?

The requirement when using the MODE.MULT function is that you need to press Ctrl + Shift + Enter to confirm the formula as an array formula. This is because MODE.MULT is designed to return multiple results, specifically the most frequently occurring values in a given set of data. Regular functions can be entered just by pressing Enter, but array functions like MODE.MULT need this special key combination to properly execute and display all of their outputs. This behavior distinguishes array functions from standard functions, allowing users to work with data in more complex ways in Excel.

Other options suggest incorrect restrictions or specifications regarding how MODE.MULT can be utilized. For instance, it is not limited to a single value range nor does it require the specification of an average range. While it is true that MODE.MULT doesn't work with text data, this is a characteristic of many numerical functions in Excel rather than a specific requirement of this function.