For example, the "-C" option (Clear arc (A) bit on extract) has "( x)" beside it, indicating that the option is meaningful only when extracting (or testing) files. The "-1" option (Fast compression) has "(a )" beside it, indicating that it is meaningful only when compressing files. The "-P" option (Set task priority) has "(ax)" beside it, meaning that it is meaningful both when extracting and when compressing.