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Lack of physical access control is the principal security risk of wireless LANs because wireless signals extend beyond physical boundaries, making it impossible to control who can physically access the network medium. Unlike wired networks where an attacker needs physical access to a port or cable, wireless networks are accessible to anyone within signal range. War driving (D) is a technique that exploits this vulnerability, not a root cause. While weak standards (B) and implementation flaws (C) are real risks, the fundamental issue is the inability to enforce physical boundaries.