After installing a new operating system, what configuration changes should be implemented?

After installing a new operating system, what configuration changes should be implemented?

A.
Create application user accounts.

B.
Rename the guest account.

C.
Rename the administrator account, disable the guest accounts.

D.
Create a secure administrator account.

Explanation:
Renaming the administrator account name and disabling the guest account will reduce the risk of a computer being attacked.