Which of the following wireless security measures, although widely implemented, does not provide strong security?

Which of the following wireless security measures, although widely implemented, does not provide
strong security?

A.
IPSec

B.
WPA2

C.
MAC address filtering

D.
802.1x

Explanation:
By MAC address filtering you can only filter layer 2 traffic but in security system layer 4 and layer 4

security is also essential.