Explanation: The demon dialing technique automatically tests every phone line in an exchange and tries to locate modems that are attached to the network. Information about these modems can then be used to attempt external unauthorized access. Answer: B is incorrect. In sniffing, a protocol analyzer is used to capture data packets that are later decoded to collect information such as passwords or infrastructure configurations. Answer: D is incorrect. Dumpster diving technique is used for searching paper disposal areas for unshredded or otherwise improperly disposed-of reports. Answer: C is incorrect. Social engineering is the most commonly used technique of all, getting information (like passwords) just by asking for them.