A Developer Is Writing a Web Application That Must Share

question 85

Multiple Choice

A developer is writing a web application that must share secure documents with end users. The documents are stored in a private Amazon S3 bucket. The application must allow only authenticated users to download specific documents when requested, and only for a duration of 15 minutes. How can the developer meet these requirements?

• A) Copy the documents to a separate S3 bucket that has a lifecycle policy for deletion after 15 minutes.
• B) Create a presigned S3 URL using the AWS SDK with an expiration time of 15 minutes.
• C) Use server-side encryption with AWS KMS managed keys (SSE-KMS) and download the documents using HTTPS.
• D) Modify the S3 bucket policy to only allow specific users to download the documents. Revert the change after 15 minutes.

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Definitions:

Discount Rate

The interest rate charged to banks for borrowing short-term funds directly from the Federal Reserve, or broadly, the interest rate used to discount future cash flows to present value.

Average Account Rate

represents the average rate of return on an investment or portfolio over a specific period.

Crossover Rate

The rate at which two different projects achieve the same net present value, often used in capital budgeting.

Capital Budgeting

The process by which a business evaluates and selects long-term investments that are worth more than their cost, considering the potential for profitability and risk.