You are examining the columns in a data set that you are analyzing. The following columns are in the data set. HotelPropertyID Contains a unique identification number for each hotel. HotelAge How many years the hotel has been operating since opening $.$ OpeningDate The date the hotel opened. RoomsAvailable The number of rooms in the hotel $.$ Rooms Rented The number of rooms rented during the year $.$ Revenue The amount of money collected for rooms rented during the year $.$ After reviewing the column headings and description $,$ which of the following would you note $?$