question: public Enumeration < Option > listOptions ( ) { Vector < Option > newVector = new Vector < Option > ( 1 ) ; newVector . addElement ( new Option ( "\tUse cross validation for model selection using the\n" + "\tgiven number of folds. (default 0, is to\n" + "\tuse training error)" , "X" , 1 , "-X <number of folds>" ) ) ; newVector . addAll ( Collections . list ( super . listOptions ( ) ) ) ; return newVector . elements ( ) ; }
target:  Returns an enumeration describing the available options.