question: @ Override public Enumeration < Option > listOptions ( ) { Vector < Option > newVector = new Vector < Option > ( 2 ) ; newVector . addElement ( new Option ( "\tSpecifies list of instances to select. First and last\n" + "\tare valid indexes. (required)\n" , "R" , 1 , "-R <inst1,inst2-inst4,...>" ) ) ; newVector . addElement ( new Option ( "\tSpecifies if inverse of selection is to be output.\n" , "V" , 0 , "-V" ) ) ; return newVector . elements ( ) ; }
target:  Returns an enumeration describing the available options.