One key difference between tariffs and quotas is that

a.$.$ tariffs put a legal limit on how much of a good can be imported, while a quota is a tax on imported goods.

b.$.$ tariffs raise revenue for the government, while quotas do not.

c.$.$ quotas raise revenue for the government, while tariffs do not.

d.$.$ tariffs cause deadweight loss, while quotas do not cause deadweight loss.