A poll solicits a large number of college undergraduates for information on the following varibles: (1)the name of their cell phone provider (AT&T, Verizon, and so on) (2)the numbers of minutes used last month (200, 400, for example) (3)their satisfaction with the service(Terrible, Adequate, Excellent, and so forth). What is the data scale(尺度) for each of these three variables?( )( )( )