question: @ Override public Enumeration < Option > listOptions ( ) { Vector < Option > newVector = new Vector < Option > ( 1 ) ; newVector . addElement ( new Option ( "\tSets the range of attribute indices (default last)." , "R" , 1 , "-R <col>" ) ) ; newVector . addElement ( new Option ( "\tInvert the range specified by -R." , "V" , 1 , "-V <col>" ) ) ; return newVector . elements ( ) ; }
target:  Returns an enumeration describing the available options.