What Is the Crucial Difference Between Ratio Schedules and Interval

What is the crucial difference between ratio schedules and interval schedules?

A) For ratio schedules, the outcome for a response is delivered only after a specific number of responses have occurred since the last reinforced or punished response. For interval schedules, the crucial measure is amount of time that has passed since the last response that was reinforced or punished.
B) For interval schedules, the outcome for a response is delivered only after a specific number of responses have occurred since the last reinforced or punished. For ratio schedules, the crucial measure is amount of time that has passed since the last response that was reinforced or punished.