Nooptreq.php

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<?php
namespace Magento\Config\Model\Config\Source;

class Nooptreq implements \Magento\Framework\Option\ArrayInterface
{
    const VALUE_NO = '';
    const VALUE_OPTIONAL = 'opt';
    const VALUE_REQUIRED = 'req';

    public function toOptionArray()
    {
        return [
            ['value' => self::VALUE_NO, 'label' => __('No')],
            ['value' => self::VALUE_OPTIONAL, 'label' => __('Optional')],
            ['value' => self::VALUE_REQUIRED, 'label' => __('Required')]
        ];
    }
}