Answer:
c. A line of credit against which additional debt may be drawn
Step-by-step explanation:
A line of credit is "open" if there are no specific payoff requirements (except perhaps a minimum payment according to the balance). There is usually a limit to the available credit, but as long as the amount borrowed is less than that limit, additional funds may be borrowed at any time.
A credit card is an example of an open line of credit.
