A company needs to run a batch data-processing job on Amazon EC2 instances. The job will run during the weekend and will take 90 minutes to finish running. The processing can handle interruptions. The

Question

Options

• ASpot Instances
• BReserved Instances
• COn-Demand Instances
• DDedicated Instances

• A
  71% (45)
• B
  16% (10)
• C
  8% (5)
• D
  5% (3)

Explanation

Spot Instances are the right choice because they offer up to 90% savings over On-Demand pricing, and the key phrase "can handle interruptions" signals that Spot's interruptible nature is acceptable - exactly the use case Spot was designed for.

Why the others are wrong:

• Reserved Instances (B) require a 1- or 3-year commitment upfront; for a 6-month weekend-only workload, you'd pay for idle capacity the rest of the week - poor value.
• On-Demand Instances (C) are flexible but carry full price with no discount; they're best for unpredictable or short-lived workloads where cost isn't the priority.
• Dedicated Instances (D) run on hardware dedicated to a single tenant, addressing compliance/licensing concerns - an irrelevant requirement here that comes at a premium cost.

Memory tip: Look for two keywords together - interruptible (or "can handle interruptions") + cost-effective - and the answer is almost always Spot. If the workload cannot tolerate interruptions but is long-term (1–3 years), think Reserved. If it's short-term and unpredictable, think On-Demand.

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