Your supervisor is upset about the fact that SNS topics that he subscribed are now cluttering up his email inbox. How can he stop receiving the email from SNS without disrupting other users’ ability to receive the email from SNS?

Answer options:

A.He can delete the subscription from the SNS topic responsible for the emails.
B.He can delete the endpoint from the SNS subscription responsible for the emails.
C.He can delete the SNS topic responsible for the emails.
D.He can use the unsubscribe information provided in the emails.

Answer – A and D
Every request has a unsubscribe URL that can be used. Also, from the AWS console, one can just delete the subscription.
Option A is CORRECT because deleting the user`s subscription from the SNS topic will ensure that he will not receive any notifications (basically just unsubscribing him).
Option B is incorrect because you cannot delete the endpoint from the SNS subscription.
Option C is incorrect because if you delete the topic, none of the subscribers will get any notifications. 
Option D is CORRECT because the notifications have an option to unsubscribe which the user can avail to stop receiving the notifications.
For more information on SNS subscription, please visit the below link.
http://docs.aws.amazon.com/sns/latest/api/API_Subscribe.html