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How should a solutions architect securely manage database credentials for an Amazon RDS instance accessed by an EC2 application, using AWS Systems Manager Parameter Store?
A
By creating an IAM role with Parameter Store read access and assigning it to the EC2 instance.
B
By creating an IAM policy for Parameter Store read access and applying it to the EC2 instance.
C
By establishing an IAM trust relationship between the Parameter Store and EC2, with Amazon RDS as the principal.
D
By establishing an IAM trust relationship between the RDS instance and EC2, with Systems Manager as the principal.
