Which schedule of partial reinforcement is correctly matched with its definition?

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Variable-interval schedule is defined as reinforcement being delivered after a fluctuating time period. A fixed-ratio schedule is defined as reinforcement being delivered after a fixed number of responses. A variable-ratio schedule is defined as reinforcement being delivered after a changing number of responses. A fixed-interval schedule is defined as reinforcement being delivered after a set time period.

Which Schedule of Partial Reinforcement Is Correctly Matched with Its