Your team is planning on creating a Lambda function which will interact with a DynamoDB stream. Which of the following would need to be in place to ensure the Lambda function can interact with the DynamoDB table?

Answer options:

A.Access Keys for an IAM user embedded in the function.
B.IAM Role with required permissions to access DynamoDB.C.The password for an IAM user in the environment variable for the Lambda function.
D.A Security group rule to allow egress traffic into DynamoDB.

Answer - B
The AWS Documentation mentions the following.
Regardless of what invokes a Lambda function, AWS Lambda always executes a Lambda function on your behalf. If your Lambda function needs to access any AWS resources, you need to grant the relevant permissions to access those resources. You also need to grant AWS Lambda permissions to poll your DynamoDB stream. You grant all of these permissions to an IAM role (execution role) that AWS Lambda can assume to poll the stream and execute the Lambda function on your behalf. You create this role first and then enable it at the time you create the Lambda function.
For more information on using Lambda with DynamoDB, please refer to the below URL-
https://docs.aws.amazon.com/lambda/latest/dg/with-ddb.html