According to the AWS Well-Architected Framework, What Change Management Steps

According to the AWS Well-Architected Framework, what change management steps should be taken to achieve reliability in the AWS Cloud? (Choose two.)

A) Use AWS Config to generate an inventory of AWS resources
B) Use service limits to prevent users from creating or making changes to AWS resources
C) Use AWS CloudTrail to record AWS API calls into an auditable log file
D) Use AWS Certificate Manager to whitelist approved AWS resources and services
E) Use Amazon GuardDuty to validate configuration changes made to AWS resources