Agatha is a small$-$business owner who is learning to handle her firm$$s finances. After struggling with a system that requires the businessperson to record each financial transaction as two separate accounting entries to maintain the accounting equation balance, you advise her that investing in some basic business software to handle this necessary task is worth every penny, even for a new startup. What is the system that Agatha is trying to learn?

a$.$ Decision$-$support system

b$.$ Management information system

c$.$ Data processing

d$.$ Auditing

e$.$ Double$-$entry bookkeeping