FluidTYPO3\Vhs\ViewHelpers\Form\Select\OptionViewHelper::initializeArguments PHP Method

    public function initializeArguments()
    {
        parent::initializeArguments();
        $this->registerUniversalTagAttributes();
        $this->registerArgument('selected', 'boolean', 'Set to TRUE to mark field as selected; otherwise detected from field value');
    }