Correct answer - "Create a high resolution custom metric and push the data using cron" : You can
alert with High-Resolution Alarms, as frequently as 10-second periods. High-Resolution Alarms
allow you to react and take actions faster, and support the same actions available today with
standard 1-minute alarms.
"Enable EC2 detailed monitoring" - With this option data is available in 1-minute periods for an
additional cost
"Simply get it from the CloudWatch Metrics" - You can get data from metrics. The basic data is
available automatically in 5-minute periods and detailed is in 1-minute periods
"Open a support ticket with AWS" - Although there is a cost for this, you are better off looking
at the documentation first