This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to set up a billing system
Use an offline billing system.
Odds are, you are already using some type of billing system. You may keep track of payments through a written list, a stack of invoice copies, or through a spreadsheet program like excel.

Choices:
A). Use the main user name that is provided to set up an offline billing system so you can search for the system you want to use. Common offline billing systems include microsoft office, moneylump, and monster.com.
B). If you're organized enough, this type of system can work for a small business, especially if you are handling a relatively low volume of transactions. If you don't have any type of existing billing system, consider using this type of simple, offline system before investing in billing software.
C). If this option is available to you, you don't need to worry about syncing the system to your computer. Create a third-party software to manage your data.
D). Have the few data that you need for each transaction with you, and commit to billing with terms and conditions agreed or agreed. Be sure to consider your pros and cons before sending or receiving these data.
The answer is:
B).