public function serialize(ClozeQuestion $clozeQuestion, array $options = [])
    {
        $serialized = [
            'text' => $clozeQuestion->getText(),
            'holes' => $this->serializeHoles($clozeQuestion),
        ];

        if (in_array(Transfer::INCLUDE_SOLUTIONS, $options)) {
            $serialized['solutions'] = $this->serializeSolutions($clozeQuestion, $options);
        }

        return $serialized;
    }