Which restaurant is NOT part of the Darden portfolio?

The correct answer indicates that Red Lobster is not part of the Darden portfolio. Historically, Red Lobster was indeed one of the iconic brands owned by Darden Restaurants until it was sold in 2014. This separation means that Red Lobster no longer belongs to the Darden family of restaurants.

In contrast, Olive Garden, Cheddar's Scratch Kitchen, and Yard House are current members of the Darden portfolio, which focuses on casual dining experiences across its brands. Olive Garden is famous for its Italian-American dishes, Cheddar's represents a mix of American comfort food, and Yard House is known for its extensive beer selection and varied menu. Therefore, the understanding that Red Lobster was previously part of Darden but is no longer associated with them clarifies why it is the correct answer in this context.