GPO in xp always creates policy with Domain Admins 2

[steve]

Hi Everyone

/usr/local/samba/var/locks/sysvol/hh3.site/Policies> ls -la
total 32
drwxrwx---+ 5 3000064 Domain Users 4096 Jul 28 10:19 
{702EB7C7-14C4-4BBB-BA8C-F85F3E7B854A}
drwxrwx---+ 5 3000064 Domain Users 4096 Jul 28 10:32 
{BDFC28AB-5BB9-493E-9A9B-7CFA446DEF6B}

For 3000064,  get:
wbinfo --sid-to-name=S-1-5-21-3605328179-531901682-1830711284-512
MARINA\Domain Admins 2

What is the 2 for?

Should I map (for readability of others) Domain Admins Or Domain Admins 
2 to 3000064?
BTW, no complains. The GPO's work fine. Just a bit confused.

Cheers,
Steve