Which of the following is considered a TCS food?

TCS stands for "Time/Temperature Control for Safety," which refers to foods that require specific temperature controls to prevent the growth of harmful bacteria. Cut leafy greens fall into this category because they are perishable and can quickly become unsafe if not stored at the appropriate temperatures. Once they are cut, the protective layers are removed, making them more vulnerable to microbial contamination and spoilage.

In contrast, canned vegetables, hard cheeses, and dry grains do not require the same stringent temperature controls as cut leafy greens. Canned vegetables, while they should be handled properly to avoid spoilage, are shelf-stable. Hard cheeses can be stored at room temperature for short periods without significant risk, and dry grains are non-perishable items that do not promote bacterial growth when kept dry. Therefore, cut leafy greens are the only TCS food among the options provided, highlighting their need for careful handling and storage.