How can the user do that easily with CloudWatch?

A user is observing the EC2 CPU utilization metric on CloudWatch. The user has observed some interesting patterns while filtering over the 1 week period for a particular hour. The user wants to zoom that data point to a more granular period.

How can the user do that easily with CloudWatch?
A . The user can zoom a particular period by selecting that period with the mouse and then releasing the mouse
B . The user can zoom a particular period by specifying the aggregation data for that period
C . The user can zoom a particular period by double clicking on that period with the mouse
D . The user can zoom a particular period by specifying the period in the Time Range

Answer: A

Explanation:

Amazon CloudWatch provides the functionality to graph the metric data generated either by the AWS services or the custom metric to make it easier for the user to analyse. The AWS CloudWatch console provides the option to change the granularity of a graph and zoom in to see data over a shorter time period. To zoom, the user has to click in the graph details pane, drag on the graph area for selection, and then release the mouse button.

Reference: http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/zoom_in_on_graph.html