Answer-first summary for fast verification
Answer: Switch from the standard compute instances to preemptible instances.
Preemptible instances are the most cost-effective for batch processing jobs like this, especially when the job can tolerate interruptions. Committed-use instances, while cost-effective, require a longer commitment (1 or 3 years) than the project's remaining duration (6 months). Standard instances are more expensive, and Cloud Functions may not be suitable for this specific batch processing need. References: [Preemptible Instances](https://cloud.google.com/compute/docs/instances/preemptible), [Committed Use Discounts](https://cloud.google.com/compute/docs/instances/signing-up-committed-use-discounts).
Author: LeetQuiz Editorial Team
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A financial organization conducts transaction analyses nightly, requiring a three-hour window between midnight and 5am. Currently, these analyses are performed on standard Compute Engine instances with OS-level guardrails for compliance. The task is to optimize costs for the next six months without compromising the ability to handle interruptions. Which option best achieves this?
A
Switch from the standard compute instances to Cloud Functions.
B
Use the current set of instances because they are the cheapest.
C
Switch from the standard compute instances to preemptible instances.
D
Switch from the standard compute instances to committed-use instances.