What is the MOST cost-effective Amazon EC2 pricing model for this scenario?

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A company creates business-critical 3D images every night. The images are batch-processed every Friday and require an uninterrupted 48 hours to complete.

What is the MOST cost-effective Amazon EC2 pricing model for this scenario?
A . On-Demand Instances
B . Scheduled Reserved Instances
C . Reserved Instances
D . Spot Instances

Answer: B