Sodium diacetate is an example of which type of antimicrobial used in RTE products?

Sodium diacetate is categorized as an antimicrobial agent used in ready-to-eat (RTE) products. This classification is based on its function in preserving food by inhibiting the growth of bacteria and other pathogens, thus enhancing food safety. Antimicrobial agents like sodium diacetate are critical in food processing because they can extend shelf life and prevent spoilage.

In the context of food preservation, the term "agent" specifically refers to substances that actively contribute to the control of microbial growth. Sodium diacetate serves this purpose effectively by lowering the pH and creating an unfavorable environment for microbial proliferation. This characteristic makes it a valuable tool for manufacturers looking to ensure the safety and quality of their RTE products.

The other options—process, substance, and treatment—do not specifically describe a functional role in microbial control like 'agent' does. A process typically refers to the methodology involved in food production, a substance is a more general term that could refer to any material without specifying its function, and treatment may imply a broader approach that could incorporate various methods of food preservation beyond just the use of antimicrobials.