You currently have an IAM user for working in the development environment using shell scripts that call the AWS CLI. The EC2 instance that you are using already contains the access key credential set and an IAM role, which are used to run the CLI and access the development environment. You were given a new set of access key credentials with another IAM role that allows you to access and manage the production environment. Which of the following is the EASIEST way to switch from one role to another?