A company has multiple AWS accounts for its development, testing, and production environments to segregate resources and manage them more efficiently. Which action would provide the developers with access to resources across these accounts while adhering to best security practices?
Create an IAM role with cross-account access permissions that developers can assume from their own account.
Apply multi-factor authentication (MFA) requirements to all production IAM users.
Create individual IAM users with the necessary permissions within each account for every developer.
Create a single master account for developers and grant it full administrative permissions in all accounts.