For setting up a secure wireless network, the best choice among the options provided is WPA2.
Here's a brief overview of the options:
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WEP (Wired Equivalent Privacy): This is an outdated and insecure protocol that has been compromised and is not recommended for securing wireless networks.
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WPA (Wi-Fi Protected Access): This was an improvement over WEP but is still not as secure as WPA2. It uses TKIP (Temporal Key Integrity Protocol), which is vulnerable to various attacks.
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WPA2: This is the most widely used and secure protocol currently available for wireless networks. It uses AES (Advanced Encryption Standard), which provides a higher level of security than WPA.
In summary, you should implement WPA2 for the best security on your friend's wireless network.