code: public void setOptions(Options opts) throws IOException, ServerException {
          Command cmd = new Command("OPTS", opts.toFtpCmdArgument());
  
          try {
              controlChannel.execute(cmd);
          } catch (FTPReplyParseException rpe) {
              throw ServerException.embedFTPReplyParseException(rpe);
          } catch (UnexpectedReplyCodeException urce) {
              throw ServerException.embedUnexpectedReplyCodeException(
                                  urce,
                                  "Server refused setting options");
          }
  
          localServer.setOptions(opts);
      }
docs: Sets the supplied options to the server.