2 pts Paul and Michael sell magazine subscriptions by telephone. Paul is paid $1.00 for every 5 calls he makes, while Michael is paid $1.00 for each call that sells a subscription. Paul’s telephoning is reinforced on a _____ schedule, whereas Michael’s is reinforced on a _____ schedule.A. Variable-ratio; fixed-ratioB. Fixed-interval; variable-ratioC. Fixed-ratio; variable-intervalD. Fixed-ratio; variable-ratio