what is the difference between an impromptu debate and an extemporaneous debate?

A. impromptu debates required three debates on each team, while extemporaneous debates require five debaters per team.

b. In an impromptu debate, participants have much less time to prepare for the debate than extemporaneous debate.

C. In an impromptu debate, participants can’t take rebuttals.

D. Impromptu debate only deal with controversial topics, while extemporaneous debates can be about any topic.