Which major retailer did the USPS announce a significant partnership with in 2021, only to face political scrutiny and eventually scale back the program?

The United States Postal Service has faced numerous financial challenges in recent decades. As a quasi-governmental agency, it has explored various retail partnerships to increase revenue and maintain service levels. This poll tests your knowledge about one of the USPS's most significant retail partnership attempts that became a political controversy.

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Amazon
Walmart
Staples
CVS Pharmacy