Which of the following is NOT an example of a common use of a point$-$of$-$sale $($POS$)$ device?

a$.$ A nurse in a hospital uses a POS to enter a patient's vital signs into his records.

b$.$ A server in a restaurant uses a POS to communicate a diner's order to the kitchen.

c$.$ A barrista in a coffee store uses a POS to record a sale of some bakery items.

d$.$ A teller in a bank uses a POS to withdraw money for a customer.