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How should a solutions architect grant the necessary permissions for an AWS Lambda function to upload files to Amazon S3, given that the developer has an existing IAM user with valid credentials?
A
Modify the Lambda function's resource policy to include the required IAM permissions.
B
Generate a signed request within the Lambda function using the IAM user's existing credentials.
C
Create a new IAM user and assign the existing IAM credentials for use in the Lambda function.
D
Establish an IAM execution role with necessary permissions and associate it with the Lambda function.
