" d-opt is of the form +keyword[=value], where keyword is:\n"
" +[no]aaflag (Set AA flag in query (+[no]aaflag))\n"
" +[no]aaonly (Set AA flag in query (+[no]aaflag))\n"
-" +[no]adflag (Set AD flag in query (default on))\n"
" +[no]additional (Control display of additional section)\n"
+" +[no]adflag (Set AD flag in query (default on))\n"
" +[no]all (Set or clear all display flags)\n"
" +[no]answer (Control display of answer section)\n"
" +[no]authority (Control display of authority section)\n"