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What is the scope of source model extend and implement between these two?

\Magento\Eav\Model\Entity\Attribute\Source\AbstractSource

\Magento\Framework\Data\OptionSourceInterface

Attribute options are loaded via the attribute’s source class. The source class must extend \Magento\Eav\Model\Entity\Attribute\Source\ AbstractSource. which further extend Magento\Framework\Option\ArrayInterface.

but when to implement \Magento\Framework\Data\OptionSourceInterface

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