Explanation: Dumpster diving technique is used for searching paper disposal areas for unshredded or otherwise improperly disposed-of reports. Answer: B is incorrect. In scanning and probing technique, various scanners, like a port scanner, can reveal information about a network’s infrastructure and enable an intruder to access the network’s unsecured ports. Answer: D is incorrect. Demon dialing technique automatically tests every phone line in an exchange to try to locate modems that are attached to the network. Answer: A is incorrect. In sniffing technique, protocol analyzer can be used to capture data packets that are later decoded to collect information such as passwords or infrastructure configurations.