An AWS service or developer-created application that triggers the execution of a Lambda function is known as

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The question asks for the AWS term used for a thing that triggers the execution of a Lambda function, whether it's an AWS service or a developer-created application.
Option 1: 'an exception handler' — An exception handler deals with errors during program execution, not with triggering Lambdas. It does not initiate Lambda invocations.
Option 2: 'an event source' — This is the correct concept: an event source is any AWS service or application that produces events which can trigger a Lambda function to run. This aligns with how Lambda is invoked in response to events.
Option 3: 'a notifier' — Notifiers typically indicate or alert about events or statuses; they don’t inherently trigger Lambda functions unless wired to do so, and in common terms they are not the designated trigger source.
Option 4: 'an input signal' — While a trigger can be described as an input signal, this term is too generic and does not map to the AWS-specific terminology of event sources that initiate Lambda executions.
Option 5: 'an execution signal origin' — This phrase is not a standard AWS term; it’s vague and does not correspond to the established nomenclature for Lambda triggers.
In summary, the most precise and official term within AWS terminology for what initiates a Lambda run is 'an event source', since it encompasses services or applications that generate events which Lambda responds to.

S2501-CPSC-4440-002-19186 Exam 1 - Midterm

An AWS service or developer-created application that triggers the execution of a Lambda function is known as

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