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You are tasked with optimizing the cost of data processing in your organization. Which of the following strategies would you implement, and why?
A
Use spot instances for Amazon EMR clusters to reduce the cost of EC2 instances.
B
Use reserved instances for Amazon RDS to reduce the cost of database instances.
C
Use AWS Lambda for data processing tasks to benefit from its pay-per-use pricing model.
D
All of the above.
