Mr$.$ Lupez misunderstood his statement and thought that he was responsible for the $$91\mathrm{.}70$ charge from his visit. He sent a check in that amount. The workers' compensation company also sent a payment of $$80\mathrm{.}00.$ Both payments were posted to Mr$.$ Lupez's account. As the charge for the office visit and Tdap immunization were the only charges on his account, these two payments created a$($n$)$:

Balance due

Credit balance

Negative credit

Overdue account