You have multiple IAM users who launch different types of compute instances and block volumes every day. As a result, your Oracle Cloud Infrastructure (OCI) tenancy quickly hit the service limit and you can no longer create any new instances. As you are cleaning up the environment, you notice that the majority of the instances and block volumes are untagged. Therefore, it is difficult to pinpoint the owner of these resources and verify if they are safe to terminate. Because of this, your company has issued a new mandate, which requires adding a predefined set of tags to identify owners before launching compute instances. Which option is the simplest way to implement this new requirement? (Choose the best answer.) 

Answer options:

A. Create tag variables to automatically tag a resource with the user name.
B. Create a policy to automatically tag a resource with the user name.
C. Create a policy using IAM requiring users to tag specific resources. This will allow a user to launch compute instances only if certain tags were defined.
D. Create tag variables for each compartment to automatically tag a resource with the user name.
E. Create a default tag for each compartment, which ensures that appropriate tags are applied at resource creation.

E

Reference: https://docs.cloud.oracle.com/en-us/iaas/Content/Tagging/Tasks/managingtagdefaults.htm