The correct answers are A (AWS Command Line Interface) and C (AWS Management Console). According to the highly voted answer and the official AWS documentation, if a user has been granted permission to change their own IAM user password, they can do so through the AWS Management Console by navigating to the IAM service and using the user interface to change the password. Additionally, they can use the AWS CLI to change their password by running the appropriate command. Options B (AWS Key Management Service), D (AWS Resource Access Manager), and E (AWS Secrets Manager) are not the services used for changing IAM user passwords.