A large multinational company has a core application that runs 24 hours a day, 7 days a week on Amazon EC2 and AWS Lambda. The company uses a combination of operating systems across different AWS…

Question

Options

• AEstablish the compute expense by the hour. Purchase a Compute Savings Plan.
• BEstablish the compute expense by the hour. Purchase an EC2 Instance Savings Plan.
• CPurchase a Reserved Instance for the instance types, operating systems, Region, and
• DUse EC2 Spot Instances to match the instances that run in each Region.

• A
  3% (1)
• B
  13% (5)
• C
  8% (3)
• D
  78% (31)

Explanation

Important note: The marked correct answer (D) appears to be incorrect for this question. The actual correct answer is A.

Option A (Compute Savings Plan) is correct because it covers both EC2 and Lambda usage in a single commitment, applies across all instance families, all operating systems, and all AWS Regions - exactly matching the company's multi-OS, multi-Region, 24/7 workload. It offers up to 66% savings with maximum flexibility, which is the stated requirement.

Why the distractors are wrong:

• B (EC2 Instance Savings Plan) locks you into a specific instance family in a specific Region, offering less flexibility and no Lambda coverage.
• C (Reserved Instances) are the least flexible - tied to a specific instance type, OS, and Region - and don't cover Lambda at all.
• D (Spot Instances) are fundamentally wrong here: Spot Instances can be interrupted with only 2 minutes' notice, making them unsuitable for any application that must run 24/7 continuously. They are for fault-tolerant, flexible workloads only.

Memory tip: Think of Savings Plans like a spectrum of flexibility - Compute > EC2 Instance > Reserved Instances. When the question mentions Lambda + EC2 + multiple Regions + most flexibility, always reach for Compute Savings Plan. And anytime a question says "runs 24/7 and cannot be interrupted," immediately eliminate Spot Instances.

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