The period of expansion ends with a$\_\_\_\_\_\_\_\_$ and the period of recession ends with a$\_\_\_\_\_\_\_\_\_\_\_\_.$

Part $2$

A$.$

business cycle$$ trough; business cycle trough

B$.$

business cycle$$ trough; business cycle peak

C$.$

business cycle$$ peak; business cycle peak

D$.$

business cycle$$ peak; business cycle trough