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A Solutions Architect is designing a three-tier web application that will allow customers to upload pictures from a mobile application. The application will then generate a thumbnail of the picture and return a message to the user confirming that the image was successfully uploaded. Generation of the thumbnail may take up to 5 seconds. To provide a sub second response time to the customers uploading the images, the Solutions Architect wants to separate the web tier from the application tier. Which service would allow the presentation tier to asynchronously dispatch the request to the application tier?
Covariance
A measure of the degree to which returns on two risky assets move in tandem. A positive covariance means that asset returns move together. A negative covariance means they vary inversely.
Variance
A measure of the dispersion of a random variable. Equals the expected value of the squared deviation from the mean.
Fairly-Priced Securities
Securities that are believed to be priced appropriately according to their risk level and the expected rate of return.
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