How to get Core commerce customer choice options?

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Hi all,

I want to get the customer choice fields options and loop through it for my purpose but i am not able to get the options inside the field of the customer choice

$dak = CoreCommerceProductOptionAttributeKey::getByHandle($_REQUEST['nproduct_id'].'_size');
this gives me just the field details but not the options related with price inside it

So can any one tell me what should i do to get out of this.
Thanks for any help