If you look at the specifications here
http://reviews.cnet.c...-3121_7-33435240.html
you'll see that (under 'Communications') 'Wireless' is shown as "802.11 a/b/g/n (draft)". That means that your laptop supports all of the 'A', 'B', 'G' and 'N' protocols.
Since a device is usually defined by the fastest protocol it can handle, you can give 'N' as the answer to the question (although the word 'draft' suggests that it's an early, and possibly uncertified, version of 'N').
If in doubt, tell the potential buyer that the spec shows 'N (draft)'.
Chris