A. Use the Python SDK to write a custom application that will monitor the Audit Log. Look for CREATE events and configure the application to send you an email each time a new resource is created.

B. Create a budget for each compartment that will send a notification when monthly spend reaches a pre-defined amount.

C. Create a tag namespace named BILLING with a Tag Key named CostCenter. Tag each of your resources with this Tag Key and the correct value.

D. Use the Events Service and create rules that will act when a new Object Storage bucket or Compute Instance has been created. Have the rule email you each time one of these events occurs.