Given this AWS SNS subscription code snippet:

medium📝 service behavior Q13 of 15

AWS - SNS and SQS

sns.subscribe({
  Protocol: 'lambda',
  Endpoint: 'arn:aws:lambda:us-east-1:123456789012:function:ProcessMessage'
});

What happens when a message is published to this SNS topic?

AThe Lambda function 'ProcessMessage' is invoked with the message payload.

BThe message is sent as an SMS to the Lambda function ARN.

CThe message is sent as an email to the Lambda function.

DThe subscription will fail because Lambda cannot be an endpoint.

Step-by-Step Solution

Solution:

Step 1: Identify protocol and endpoint meaning
Protocol 'lambda' means SNS invokes the specified Lambda function ARN when a message is published.
Step 2: Understand message delivery behavior
The Lambda function 'ProcessMessage' is called with the message payload as input.
Final Answer:
The Lambda function 'ProcessMessage' is invoked with the message payload. -> Option A
Quick Check:
Lambda protocol triggers function invocation [OK]

Quick Trick: Lambda protocol triggers function call, not email or SMS [OK]

Common Mistakes:

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