Which of the following allows an application running on an Amazon EC2 instance to securely write data to an Amazon S3 bucket without using long term credentials?

Which of the following allows an application running on an Amazon EC2 instance to securely write data to an Amazon S3 bucket without using long term credentials?
A . Amazon Cognito
B . AWS Shield
C . AWS IAM role
D . AWS IAM user access key

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Answer: C