AIncorrect
On-Demand Instances
On-Demand pricing is flexible pay-as-you-go pricing, but there are no discounts and the per-unit cost is higher.
It does not satisfy the requirement of discounts of up to approximately 90%, so this is incorrect.
A company wants to run a large number of batch jobs that can be re-executed if interrupted, at the LOWEST possible cost. Which EC2 purchasing option offers discounts of up to approximately 90% compared to On-Demand pricing?
1 / 1
Select an answer
CorrectB
Explanation
A question asking which EC2 purchasing option runs interruptible workloads at the lowest cost.
- 1「re-executed if interrupted」Interruption-tolerant = suited for Spot Instances
- 2「LOWEST possible cost」Select the cheapest purchasing option
- 3「discounts of up to approximately 90%」Characteristic of Spot Instances
BCorrect
Spot Instances
This is correct. Spot Instances leverage AWS spare capacity and can be used at discounts of up to approximately 90% compared to On-Demand pricing. Because they may be interrupted when capacity is needed, they are well suited for batch jobs and stateless workloads that can tolerate interruptions and be re-executed.
CIncorrect
Dedicated Host
A Dedicated Host is a purchasing option that provides a dedicated physical server, designed for licensing or compliance requirements.
It is not a low-cost execution option targeting discounts of up to approximately 90%, so this is incorrect.
DIncorrect
Reserved Instances
Reserved Instances are an option that provides discounts in exchange for a 1-year or 3-year commitment, designed for stable, predictable workloads.
They differ from Spot Instances, which allow interruptions and offer discounts of up to approximately 90%, so this is incorrect.
Key Takeaway
'Interruptible', 'up to ~90% discount', and 'batch' all point to Spot Instances. Long-term discounts for stable workloads use Reserved Instances or Savings Plans; flexible but undiscounted workloads use On-Demand; dedicated server requirements use Dedicated Hosts.