A user has a group of .xlsx files they would like to import using one input tool and a wildcard. Which statements must be true about files in order to successfully import all of them? Select all that apply

a.All files must have the same number of columns

b.All files must have under 1 MB of data

c.The data types for corresponding columns must align (i.e column 1 in every file is a string)

d.All files must be in the same folder