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SAA-C03 · Question #160

A company hosts a multi-tier inventory reporting application on AWS. The company needs a cost- effective solution to generate inventory reports on demand. Admin users need to have the ability to…

The correct answer is D. Lambda + SES: Most cost-effective and efficient solution for generating and emailing reports. The company needs a cost-effective, on-demand solution for admin users to generate 5-10 minute inventory reports and email them.

Submitted by ahmad_uae· Mar 4, 2026Design Cost-Optimized Architectures

Question

A company hosts a multi-tier inventory reporting application on AWS. The company needs a cost- effective solution to generate inventory reports on demand. Admin users need to have the ability to generate new reports. Reports take approximately 5-10 minutes to finish. The application must send reports to the email address of the admin user who generates each report. Which solution will meet these requirements?

Options

  • AECS + API Gateway: Overly complex and costly for an on-demand, intermittent workload.
  • BEventBridge + SNS: EventBridge schedules are unnecessary for on-demand generation.
  • CEKS + API Gateway: Overkill for this use case, with high operational overhead.
  • DLambda + SES: Most cost-effective and efficient solution for generating and emailing reports

How the community answered

(47 responses)
  • A
    2% (1)
  • B
    9% (4)
  • C
    17% (8)
  • D
    72% (34)

Why each option

The company needs a cost-effective, on-demand solution for admin users to generate 5-10 minute inventory reports and email them.

AECS + API Gateway: Overly complex and costly for an on-demand, intermittent workload.

Using Amazon ECS with API Gateway for this intermittent, on-demand workload would incur higher costs for running container instances, even when idle, and significantly more operational overhead compared to a serverless Lambda solution.

BEventBridge + SNS: EventBridge schedules are unnecessary for on-demand generation.
CEKS + API Gateway: Overkill for this use case, with high operational overhead.
DLambda + SES: Most cost-effective and efficient solution for generating and emailing reportsCorrect

AWS Lambda functions are ideal for on-demand, event-driven workloads, providing a cost-effective pay-per-execution model without idle charges, perfectly suiting the 'on demand' and '5-10 minutes' report generation. Amazon Simple Email Service (SES) is a scalable and cost-effective email sending service that Lambda can invoke to deliver reports to admin users via email.

Concept tested: Serverless architecture, cost-effective event-driven processing, email

Source: https://aws.amazon.com/lambda/

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