Statements A, B, C and D correctly describe Wi-Fi, Bluetooth, cellular data and wireless security. Wi-Fi and Bluetooth are radio-based technologies, cellular networks provide mobile Internet and encryption protocols such as WPA2 enhance wireless security. Statement E is false because wireless signals can be intercepted and require protection, and F is false since disabling wireless can save battery and reduce attack surface. Thus the correct combination includes A, B, C and D only.
Option A:
Option A is incorrect because it omits D and therefore ignores the importance of encryption for securing Wi-Fi data. While A, B and C are true, they do not include the crucial aspect of wireless security.
Option B:
Option B is incorrect because it adds E, which wrongly claims that interception is impossible and security is irrelevant. Including this false statement makes the entire combination invalid.
Option C:
Option C is incorrect because it omits A and does not acknowledge Wi-Fi as a widespread wireless LAN technology. Although B, C and D are true, leaving out A means the set does not capture the full picture.
Option D:
Option D is correct because it recognises the main wireless technologies and emphasises the role of encryption. It excludes unrealistic claims about interception and power usage, aligning with sound understanding of wireless networking.
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