Using client PC to find the functnl level of my log-in AD domain

Using Windows XP service pack3 to login to AD domain.
Running the GPresult from the command prompt returns the following:

RSOP results for TMS\TABATAJ on PD9403355 : Logging Mode
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OS Type:                     Microsoft Windows XP Professional
OS Configuration:            Member Workstation
OS Version:                  5.1.2600
Domain Name:                 ABC
Domain Type:                 Windows 2000
Site Name:                   DATA-HUB-SITE
Roaming Profile:             
Local Profile:               C:\Documents and Settings\tabataj
Connected over a slow link?: No

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Can I conclude that the Functional level of the AD domain that I am logging 
into is windows 2000 (opposed to windows 2003 or .... ) 
Is there an equivalent WMI  call for me to find the version of the AD?

Thanks

Jay