You are the Security Administrator for your company. You need to manage the CMK keys for your company’s account. You have been requested to create ALIAS for keys. Which of the following facts do you need to be aware of when creating ALIAS keys?
Choose 2 Options.

Answer options:

A.The ALIAS key must be unique in the AWS account and region.
B.An ALIAS key can point to multiple CMK keys at a time.
C.Each CMK key can have multiple ALIASs points to it.
D.After the ALIAS is created, it cannot be modified to point to another CMK.

Answer – A and C
The AWS Documentation mentions the following.
Each CMK can have multiple aliases, but each alias points to only one CMK. The alias name must be unique in the AWS account and region. To simplify code that runs in multiple regions, you can use the same alias name but point it to a different CMK in each region.
You can use AWS KMS API operations to list, create, and delete aliases. You can also update an alias, which associates an existing alias with a different CMK. There is no operation to edit or change an alias name. If you create an alias for a CMK that already has an alias, the operation creates another alias for the same CMK. To change an alias name, delete the current alias and create a new alias for the CMK.
Since the AWS Documentation clearly mentions the dimensions of the aliases, the other options are invalid.
For more information on working with ALIASs, please visit the below URL
https://docs.aws.amazon.com/kms/latest/developerguide/programming-aliases.html