Which is it? System or Active

I'm very confused on which is the current HDD that I am booting from and is currently in use?

From the Microsoft help screen:

"Volumes with the Healthy status often display an associated substatus (in parentheses). A volume may only display one substatus at a time. The substatus is displayed according to the order in which it appears in the table below. For example, if you have only one volume which serves as the boot volume, system volume, active volume, page file, and crash dump, its status is displayed as Healthy (System). However, if an error occurs on a dynamic volume, the (At Risk) substatus takes precedence."

The HDD that I used is my "D" drive and its showing as "Healthy (active)"

The help screen says: Active volume: "the volume from which the computer starts up".

My "C" HDD is showing as "Healthy (system)"

This indicates to me that the drive I am using is my "C" drive.

The instructions above indicate that my Healthy (system) is also my "boot drive". Yet the instructions for an Healthy (active) volume say that this is the volume that starts up my system. Which is it?

Jim