A. Retention period can't be changed - https://docs.oracle.com/en-us/iaas/Content/Audit/Tasks/settingretentionperiod.htm D. Logs from Object Storage bucket goes to Logging Analytics - https://docs.oracle.com/en-us/iaas/logging-analytics/doc/collect-logs-your-oci-object-storage-bucket.html

A. Retention period for Audit logs is 365 days and it cannot be changed. In Oracle Cloud Infrastructure (OCI), you can configure the retention period for Audit logs, and it is not fixed at 365 days. You can set a custom retention period for your audit logs, depending on your organization's requirements. So, statement A is not correct.

By default, Audit logs are retained for 365 days. You can view the log retention period in the tenancy details page.... The retention period cannot be changed. https://docs.oracle.com/en-us/iaas/Content/Audit/Tasks/settingretentionperiod.htm#:~:text=By%20default%2C%20Audit%20logs%20are,domains%2C%20see%20Managing%20the%20Tenancy

A. Retention period for Audit Logs can be modified. D. is also incorrect, modifications in object storage bucket goes to service logs

The retention period for Audit logs in OCI can be changed, and it is not limited to a fixed duration of 365 days.

O período de retenção é uma configuração de nível de locação. O valor da configuração do período de retenção afeta todas as regiões e todos os compartimentos. O período de retenção não pode ser alterado.

Changes within buckets are recorded..

D - https://docs.oracle.com/en-us/iaas/Content/Audit/Tasks/settingretentionperiod.htm

A is the correct answer. by default audit retention period is 90days but can be extended not beyond 1yr (365days)