How many days before the mailing date must the Coding Accuracy Support System be completed for carrier route mailings?

The correct answer, indicating that the Coding Accuracy Support System (CASS) must be completed 90 days before the mailing date for carrier route mailings, reflects the requirement set by postal regulations for ensuring the accuracy of address data. CASS certification is essential for mailers aiming to obtain bulk mailing discounts, as it verifies that addresses conform to postal standards and are deliverable.

Meeting the 90-day requirement allows sufficient time for the mail to be processed, validated, and any necessary corrections to be made. It also ensures that mailers can structure their campaigns effectively, taking into account the time needed for sorting and preparing the mail for distribution.

When considering the other options, such as 120 days or longer periods, they exceed the necessary timeframe outlined by postal guidelines, creating additional hurdles for mailers without added benefit. A requirement of 60 days may seem more manageable, but it does not provide the buffer needed for the rigors of data verification and addressing accuracy essential for carrier route mailings. Thus, the 90-day lead time offers a balanced approach, ensuring both compliance and operational efficiency.