Answer - A and C
The AWS Documentation mentions the following.
The Amazon S3 notification feature enables you to receive notifications when certain events happen in your bucket. To enable notifications, you must first add a notification configuration identifying the events you want Amazon S3 to publish, and the destinations where you want Amazon S3 to send the event notifications.
Go in S3 bucket properties, and events. Then choose the relevant event, and select send to as SNS topic.
Option B is incorrect since you need to create an SNS topic that could be used to send an email to multiple IT administrators.
Option D is incorrect since the event notification needs to be placed on the bucket and not the object.
NOTE:
Options C and D are different.
Option C: Add an event notification to the S3 bucket.
Option D: Add an event notification to the S3 object.
For more information on AWS S3 notifications, please visit the URL-
https://docs.aws.amazon.com/AmazonS3/latest/dev/NotificationHowTo.html