<span dir="LTR">You are working in a Cloud Security team and your team owns an AWS account A (111111111111) that uses Amazon EventBridge to collect the events happening in other AWS accounts and check if there are security breaches. A new AWS account B (222222222222) has been recently configured to send events to account A. You need to create a rule in your account A to receive and match the events only from account
B. How would you set up the rule in Amazon EventBridge?</span>

Answer options:

A.Edit the event pattern in the new rule and add the following to match the events that are sent by AWS account B:
{
"account": [
"222222222222"
],
...
}
B.Select the custom pattern in the new rule and choose the custom event bus that is used by AWS account
B. Enable the rule on the selected event bus.
C.In the new EventBridge rule, select the "pre-defined pattern by AWS account". In the account drop-down list, select the AWS account B (222222222222).
D.Select “All Events” in the service provider of the rule. Configure a Lambda function as the target and filter the events based on the JSON-formatted input in the Lambda function.

Correct Answer : A
Option A is CORRECT because this is the correct way to filter the events from another account. The following is an example:
Option B is incorrect because account B may use the default event bus instead of a custom event bus. The custom event bus may also be used by other AWS accounts. It is improper to use this method to match the events from AWS account
B.Option C is incorrect because there is no "pre-defined pattern by AWS account". Instead, you can choose a predefined pattern based on AWS services or third-party service partners.
Option D is incorrect because it is not suitable to choose “All Events” without filtering it. You can match the events by the account ID added in the event pattern of the rule.
Reference:
https://docs.aws.amazon.com/eventbridge/latest/userguide/eventbridge-cross-account-event-delivery.html