Which AWS services should the user configure in this case?

A user is running a webserver on EC2. The user wants to receive the SMS when the EC2 instance utilization is above the threshold limit.

Which AWS services should the user configure in this case?
A . AWS CloudWatch + AWS SQ
C . AWS CloudWatch + AWS SN
E . AWS CloudWatch + AWS SE
G . AWS EC2 + AWS Cloudwatch.

Answer: B

Explanation:

Amazon SNS makes it simple and cost-effective to push to mobile devices, such as iPhone, iPad, Android, Kindle Fire, and internet connected smart devices, as well as pushing to other distributed services. In this case, the user can configure that Cloudwatch sends an alarm on when the threshold is crossed to SNS which will trigger an SMS.

Reference: http://aws.amazon.com/sns/