An Online Photo Application Lets Users Upload Photos and Perform

question 305

Multiple Choice

An online photo application lets users upload photos and perform image editing operations. The application offers two classes of service: free and paid. Photos submitted by paid users are processed before those submitted by free users. Photos are uploaded to Amazon S3 and the job information is sent to Amazon SQS. Which configuration should a solutions architect recommend?

• A) Use one SQS FIFO queue. Assign a higher priority to the paid photos so they are processed first.
• B) Use two SQS FIFO queues: one for paid and one for free. Set the free queue to use short polling and the paid queue to use long polling.
• C) Use two SQS standard queues: one for paid and one for free. Configure Amazon EC2 instances to prioritize polling for the paid queue over the free queue.
• D) Use one SQS standard queue. Set the visibility timeout of the paid photos to zero. Configure Amazon EC2 instances to prioritize visibility settings so paid photos are processed first.

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Definitions:

Critical Value

A threshold value in hypothesis testing, beyond which the null hypothesis is rejected, determined by the chosen significance level.

Df

Df, or degrees of freedom, often used in statistical analysis, is the number of independent pieces of information available to estimate another piece of information.

Mean Square

A statistical measure used primarily in the context of ANOVA, representing the average of the squares of differences from the mean, indicative of variance.

Main Effect

The direct impact of an independent variable on a dependent variable in an experimental study, ignoring the effects of other independent variables.