听力原文：W I think we may be able to increase our order above the 500 units I quoted you e

arlier. But if we do this, do you have any flexibility on price？

M Absolutely. I can give you an extra 5 percent off. And I could cut a little more off if you're interested in purchasing a maintenance agreement with us. Does that interest you at all？

W Yes, I'm sure we can do that. How long is the maintenance contract good for？

M We have a basic 1 -year and an expanded 3-year plan. The longer plan includes free upgrades.

What are the speakers doing？

A．Negotiating a sale

B．Purchasing a printer

C．Opening a bank account

D．Discussing membership terms