How Are Checks Which Are Deposited into a Typical Lockbox

How are checks which are deposited into a typical lockbox handled?

A) The checks are deposited into a local bank which then overnights one check for the entire amount to the firm.
B) The checks are collected once a day, normally in the early morning, by a bank employee.
C) The checks are posted to the customer's account prior to being deposited.
D) The checks are collected throughout the day and immediately deposited into the firm's account.
E) The checks are collected and sent overnight to the firm's main office for processing.