Changing 802.11 a/b/g/n card to a 802.11 AC 5.0 card

At the university I attend, they require that my laptop have a 802.11 AC 5.0 wireless card to be able to work on their network. The Macbook Pro that I have is a mid-2012 15.4" Retina model that comes with a 802.11 a/b/g/n wireless card. This is it here. Is it possible for me to order the part and change it? I do not care if it voids the warranty, it has already lapsed. If I can replace it, what model card do I need to buy so that it is compatible with my laptop, and with my school's requirements?

Additional Question: Does my Macbook have WPA2 Wireless by default, or is that another factor I need to consider when purchasing a 802.11 AC 5.0 wireless card?

Thanks in advance!