—Excuse me, have you got a light?

—_____. I don't smoke.[ ]

A. Don't mention it

B. Never mind

C. I'm afraid not

D. Thanks a lot

以下是内部评级关键指标的有（）

A、违约概率

B、违约损失率

C、违约风险暴露

D、预期损失

E、拨备覆盖率