A. "The first critical step in securing a system is to secure the base operating system", Interpret the Basic steps for Operating Systems Hardening. B. "Security Control is an urgent need for any computer system", Based on this sentence: 1. Briefly summarize the Control Classifications 2. Discriminate the difference between: i) Supportive controls, ii) Preventative controls, i) Detection and recovery controls C. llustrate, with examples, the difference between Security Audit and Security Access control and identify the seven Implementation Guidelines for Security Auditing. D. If you are going to build an IT Security Plan for an information system: 1. Briefly describe the details that should be iouded in this plan. 2. Defend the tasks that must be followed during the Maintenance process