AIX install question

I have AIX 6.1 on my system.

I need to install cifs on my system.  My notes say I should run the following command:

installp -ac -d /dev/cd0 bos.cifs_fs

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My question:  For this command to work, which of the following disks do I need in the CD drive

  AIX 6.1,    1 of 2
  AIX 6.1,     2 of 2
  AIX 6.1 Update

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Thanks