Which of the following combinations would provide the auditor the most persuasive evidence? 
Definitions:
Collection Delay
The time lag between when a payment is made by a customer and when the funds are available to the recipient.
Lockbox System
A service offered by banks to companies for the receipt of payment from customers, involving the collection of payments directly at a postal box and swiftly depositing them into the company's bank account.
Treasury Bills
Government-issued securities with maturity of up to a year, offered below their nominal value.
Collection Time
The duration it takes for a business to receive payments owed by its customers after a sale has been made.
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