Which of the following is an effective countermeasure against mobile device threats?

Question

Options

• AKeeping Bluetooth enabled at all times
• BRegular software updates
• CDisabling all security features
• DJailbreaking devices

• A
  4% (1)
• B
  92% (24)
• D
  4% (1)

Explanation

Regular software updates (B) are a foundational countermeasure against mobile threats because they patch known vulnerabilities, fix security flaws, and protect against exploits that attackers actively target on unpatched devices.

Why the distractors are wrong:

• A (Bluetooth always on): Leaves devices exposed to Bluetooth-based attacks like bluejacking, bluesnarfing, and man-in-the-middle interception - it should be disabled when not in use.
• C (Disabling security features): Removes the very protections designed to defend the device, making it trivially easy to exploit.
• D (Jailbreaking): Removes OS-level sandboxing and manufacturer security controls, bypasses app store vetting, and dramatically expands the attack surface.

Memory tip: Think "Update = Upgrade your defense." Every other option removes protection - only B adds it. If an answer removes a built-in safeguard, it's almost certainly wrong on a security exam.

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