Freemethod.php

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

class Freemethod extends \Magento\Fedex\Model\Source\Method
{
    public function toOptionArray()
    {
        $arr = parent::toOptionArray();
        array_unshift($arr, ['value' => '', 'label' => __('None')]);
        return $arr;
    }
}