You are uploading multiple files ranging 10 GB – 20 GB in size to the AWS S3 bucket by using a multi-part upload from an application on EC2. Once the upload is complete, you would like to notify a group of people who do not have AWS IAM accounts. How can you achieve this? (Select TWO)

Answer options:

A.Use S3 event notification and configure Lambda function which sends email using AWS SES non-sandbox.
B.Use S3 event notification and configure SNS which sends email to subsribed email addresses.
C.Write a custom script on your application side to poll S3 bucket for new files and send email through SES non-sandbox.
D.Write a custom script on your application side to poll S3 bucket for new files and send email through SES sandbox.

Answer: A and B
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.
AWS Simple Email Service (SES) is a cost-effective email service built on the reliable and scalable infrastructure that Amazon.com developed to serve its own customer base. With Amazon SES, you can send transactional emails, marketing messages, or any other type of high-quality content.
While your account is in the sandbox, you can use all of the features of Amazon SES. However, when your account is in the sandbox, we apply the following restrictions to your account:
You can only send mail to verified email addresses and domains or to the Amazon SES mailbox simulator.
You can only send mail from verified email addresses and domains.
https://docs.aws.amazon.com/ses/latest/DeveloperGuide/request-production-access.html
Option A triggers Lambda function which uses non-sandbox SES to send email to people who does not have an AWS IAM account nor are verified in AWS SES.
https://aws.amazon.com/premiumsupport/knowledge-center/lambda-send-email-ses/
Option B is correct as it triggers SNS.
https://docs.aws.amazon.com/AmazonS3/latest/dev/ways-to-add-notification-config-to-bucket.html
Options C and D are incorrect because they needs compute resources to monitor S3 for new files continuously.
References:
https://docs.aws.amazon.com/AmazonS3/latest/userguide/notification-how-to-event-types-and-destinations.html#supported-notification-event-types
https://docs.aws.amazon.com/AmazonS3/latest/userguide/NotificationHowTo.html