On Linux systems, Jenkins environment variables such as AWS access key ID, secret access key, and default region are commonly configured in the /etc/sysconfig/Jenkins file. This file allows administrators to define environment variables that are loaded when the Jenkins service starts. By placing AWS credentials and region information in this file, Jenkins jobs and plugins---such as the AWS Secrets Manager Credentials Provider---can securely access AWS resources. The other options reference invalid paths or unrelated configuration files (such as Filebeat). Editing /etc/sysconfig/Jenkins ensures consistent credential availability across Jenkins jobs while supporting secure integration with AWS services during the Code stage.