To answer this question, you need to understand the security risks associated with wireless LANs.
Option A) Lack of physical access control - This option is correct because one of the principal security risks of wireless LANs is the lack of physical access control. Unlike wired networks, wireless networks can be accessed from outside the physical premises, making it easier for unauthorized users to gain access to the network.
Option B) Demonstrably insecure standards - This option is incorrect because while there have been instances where wireless LAN standards have been found to have security vulnerabilities, it is not a principal security risk. The standards can be updated and improved to address these vulnerabilities.
Option C) Implementation weaknesses - This option is incorrect because while implementation weaknesses can be a potential security risk, it is not a specific risk associated only with wireless LANs. Implementation weaknesses can occur in any type of network, including wired networks.
Option D) War driving - This option is incorrect because war driving refers to the act of searching for and mapping wireless networks by driving around with a wireless-enabled device. While war driving can be associated with unauthorized access to wireless LANs, it is not a principal security risk in itself.
The correct answer is A) Lack of physical access control. This option is correct because it highlights the key security risk of wireless LANs, which is the ability for unauthorized users to gain access to the network from outside the physical premises.