Points: $1$

Using the Directory tool, which file specification is used to determine a single letter within the file name $($for example, File$=$"Region$\_$E$.$csv$"$ but not "Region$\_$Totals.csv$")?$

A$.$ Region$\_1.$csv

B$.$ Region$\_*.$csv

C$.$ Region$\_?.$csv

D$.$ Region$\_!.$csv

Clear selection