Which device allows customers to perform basic banking transactions, such as withdrawals?

The correct choice is an automated teller machine (ATM) because it is specifically designed to dispense cash and facilitate basic banking transactions for customers without the need for a bank teller. ATMs allow users to perform essential functions such as cash withdrawals, balance inquiries, and in some cases, deposits or transfers. They provide a convenient option for customers to access their funds outside of normal banking hours or in locations away from their branch.

While other options such as online banking and mobile banking apps do offer transaction capabilities, they do so through digital interfaces and require internet access. Point of sale terminals are primarily for processing sales and transactions in retail environments rather than for direct banking operations like withdrawals.