______ is an opt-in, invitation-only program where participants can earn monthly rewards by sharing receipts from purchases made outside of Amazon.com, completing short surveys, and enabling ad verification for ads they see.

The correct answer is Amazon Shopper Panel because this program is specifically designed as an opt-in, invitation-only initiative that rewards participants for sharing receipts from purchases made outside of Amazon.com, completing short surveys, and enabling ad verification for ads they encounter. By participating in the Amazon Shopper Panel, users can earn monthly rewards while providing valuable insights that help Amazon and advertisers better understand shopping behaviors and preferences. In contrast, Amazon Attribution focuses on measuring the impact of marketing efforts on Amazon, while Amazon Marketing Cloud is a data analysis tool that helps advertisers make sense of their advertising data, making the Amazon Shopper Panel the most accurate choice for this description.