Answer:
d. Time-Sharing
Explanation:
According to my research on information technology, I can say that based on the information provided within the question this is an example of Time-Sharing. This term refers to when many people, that are using different terminals, all use the computer system at the exact same time. Which in this case is exactly what the people at the bank are doing by running large reports on the mainframe.
I hope this answered your question. If you have any more questions feel free to ask away at Brainly.