Which formula returns the first and last name of the current user?

The formula that returns the first and last name of the current user is "UserToName(CurrentUser())". This is because the function "CurrentUser()" retrieves the ID of the user currently logged into the Quickbase application. When this ID is passed to the "UserToName()" function, it converts the user ID into a readable format, specifically the full name encompassing both first and last names.

This approach effectively brings together the user identification and name representation, ensuring that the full name of the current user is returned correctly. The other options do not deliver the desired outcome for obtaining the full name. For instance, using "ToUser(User())" and "UserToName(User())" would not yield the current user's name, as they either reference different contexts or return user information in formats not intended for displaying names. Additionally, "CurrentUserName()" is an existing function, but it is incorrect in this context because it typically returns only the username or email address rather than the full name. Therefore, "UserToName(CurrentUser())" is the correct formula for obtaining the first and last name of the current user in Quickbase.