Exam AWS Certified SysOps Administrator - Associate topic 1 question 139 discussion

In a consolidated billing account, member linked account metrics are captured only if the payer account enables the Receive Billing Alerts preference. If you change which account is your management/payer account, you must enable the billing alerts in the new management/payer account.

Before you can create an alarm for your estimated charges, you must enable billing alerts, so that you can monitor your estimated AWS charges and create an alarm using billing metric data. After you enable billing alerts, you can't disable data collection, but you can delete any billing alarms that you created. After you enable billing alerts for the first time, it takes about 15 minutes before you can view billing data and set billing alarms. https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/monitor_estimated_charges_with_cloudwatch.html#turning_on_billing_metrics:~:text=Before%20you%20can%20create%20an%20alarm%20for%20your%20estimated%20charges%2C%20you%20must%20enable%20billing%20alerts%2C%20so%20that%20you%20can%20monitor%20your%20estimated%20AWS%20charges%20and%20create%20an%20alarm%20using%20billing%20metric%20data.

B is the answer. By default, the management/payer account has access to billing information for all the accounts in the organization. It can enable billing alerts and set up notifications for cost thresholds. However, in this scenario, the managers of the member accounts are unable to configure a billing alarm. This indicates that the issue lies with the permissions and access of the managers, rather than the configuration of the management/payer account.

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A is correct

Ans: A Ref. https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/monitor_estimated_charges_with_cloudwatch.html#turning_on_billing_metrics