Answer:
Option e. Used to speed up the collection of checks received.
Explanation:
A lockbox plan is most beneficial to firms involved in collections over a wide geographic area. It is also a method or technique to limit/reduce float by having payments sent to local post offices close to the customers. Its system of handling cash receipts is by mail where the customers remit payments directly to the bank.
In cash management, a lockbox plan is used to quickens the rate of collection of checks received.