Diego is correct because the loan has to be paid in full by a specific date.
Answer:
The answer is: Diego is correct, this is a closed-end loan.
Explanation:
A closed-end credit has to be repaid in full by a specific date, in this case 48 months.
An open-end credit is a loan that can be borrowed after it is repaid, they are also called revolving credits. If this was a revolving credit, after paying her car loan Sienna would be able to get the same loan again.