What tactic is being used when an attacker trailing closely behind an employee enters a restricted area without any security credentials by utilizing their proximity to another employee with security clearance?
A. Shoulder surfing
B. Footprinting
C. Piggybacking
D. Dumpster diving
Answer: C
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Consider a database schema with four relations: Supplier, Product, Customer, and Contracts. Both the Supplier and the Customer relations have the attributes Id, Name, and Address. An Id is a nine-digit number. Product has PartNumber (an integer between 1 and 999999) and Name. Each tuple in the Contracts relation corresponds to a contract between a supplier and a customer for a speci?c product in a certain quantity for a given price.
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A. circular B. square C. triangular D. arrow