What type of certified software is required to assign Carrier Route codes?

The correct answer pertains to CASS, which stands for the Coding Accuracy Support System. CASS-certified software is essential for accurately assigning Carrier Route codes. These codes are crucial for optimizing mail delivery efficiency by ensuring that mail is sorted correctly based on the specific routes that postal carriers will take.

CASS certification ensures that the software adheres to the U.S. Postal Service's standards for accuracy in addressing, and it helps to improve the overall effectiveness of mail processing and delivery. By using CASS-certified software, businesses can enhance their mailing operations, reduce costs associated with undeliverable mail, and streamline their communication efforts with customers.

The other options, while relating to postal services, focus on different aspects of mailing systems. For example, ARUS stands for the Address Resolution Update Service, which is used for address verification but does not specifically deal with assigning Carrier Route codes. SAS refers to software for the Standardized Addressing System, which aids in formatting addresses but lacks the specific certification for Carrier Route coding. ECAS is another service, but it typically involves electronic submission processes rather than direct application in assigning Carrier Route codes. Thus, CASS is uniquely tailored for ensuring accurate assignment of these important postal codes.