Which solution meets these requirements?
Set up S3 bucket policies to allow access from a VPC endpoint.
Set up an IAM policy to grant read-write access to the S3 bucket.
Set up a NAT gateway to access resources outside the private subnet.
Set up an access key ID and a secret access key to access the S3 bucket.
Explanations:
A VPC endpoint for S3 provides a private, secure connection between EC2 instances in a VPC and Amazon S3. It ensures that traffic does not traverse the public internet, aligning with the requirement for a private and secure connection.
IAM policies control access to resources, but they do not establish a private, secure connection between EC2 and S3. A VPC endpoint is needed for secure communication.
A NAT gateway is used for outbound internet access from a private subnet but does not provide a private, secure connection between EC2 and S3.
Using access keys and secret access keys only grants access to the S3 bucket but does not secure the connection or keep it private, which is the core requirement in this scenario.
To the best of my knowledge, the answer is:
Set up S3 bucket policies to allow access from a VPC endpoint.