A user is sending a custom metric to CloudWatch. If the call to the CloudWatch APIs has different dimensions, but the same metric name, how will CloudWatch treat all the requests?

A. It will treat each unique combination of dimensions as a separate metric.
B. It will group all the calls into a single call.
C. It will overwrite the previous dimension data with the new dimension data.
D. It will reject the request as there cannot be a separate dimension for a single metric.