What rule requires intermediaries to pass along information in wire transfers?

The travel rule is the correct answer because it mandates that financial institutions involved in wire transfers must ensure that certain information about the transaction is included and passed along in each step of the transfer process. This rule, part of the Bank Secrecy Act, aims to enhance the transparency and traceability of funds, making it harder for illegal activities, including money laundering, to occur.

Under the travel rule, details such as the sender's name, account number, and the recipient's name must be transmitted along with the wire transfer. By doing so, authorities and institutions can more effectively monitor and mitigate the risks associated with financial crime. This requirement supports broader regulatory efforts to maintain the integrity of the financial system by ensuring that necessary information follows the money as it moves through the banking system.