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You need to create a simple, holistic check for your system’s general availablity and uptime. Your system presents itself
as an HTTP-speaking API. What is the most simple tool on AWS to achieve this with?

A.
Route53 Health Checks

B.
CloudWatch Health Checks

C.
AWS ELB Health Checks

D.
EC2 Health Checks

Explanation:
You can create a health check that will run into perpetuity using Route53, in one API call, which will ping your service via
HTTP every 10 or 30 seconds. Amazon Route 53 must be able to establish a TCP connection with the endpoint within
four seconds. In addition, the endpoint must respond with an HTTP status code of 200 or greater and less than 400 within
two seconds after connecting.
http://docs.aws.amazon.com/Route53/latest/DeveloperGuide/dns-failover-determining-health-of-endpoints.html

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