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2. (10 points) Web and System Security (a) (2 points) What are the ethical responsibilities of computer engineers when working with private customer data? (b) (2 points) Explain how an XSS attack works and how it can be prevented. (c) (2 points) Explain how SQL injection works and how it can be prevented. (d) (4 points) State the four types of firewalls and explain briefly how they work. - Packet filtering: applies set of rules to filter packets based on IP address and/or port numbers - Stateful inspection: combines packet-filtering capabilities with connection status - Application proxy: acts as a relay between the host and the server. Based on the application used, it decides whether it forwards data or not - Circuit-level proxy: decides whether a TCP connection between two nodes should be established or not