An Auto Scaling group has a new launch-template version but existing instances still run the old AMI. The team needs a controlled fleet replacement. Which steps are appropriate? Select 2 answers.

1. Start an instance refresh with the intended launch configuration and appropriate healthy-capacity limits.
2. Replace all capacity simultaneously regardless of application availability requirements.
3. Deregister every older AMI before the new instances become healthy.
4. Assume changing the launch-template version rewrites every running root volume in place.
5. Set suitable warmup and validation behavior and retain a known-good configuration for recovery.