TCP 443 is for https. If you scan a web server it's normal to be opened.
There is only a small chance to be used by a backdoor virus type.
End of life systems detected have vulnerabilities spread over all the internet.

Explanation/Reference:
Explanation:
The Control Objectives for Information and related Technology (CobiT) is a framework and set of control objectives developed by the Information Systems Audit and Control Association (ISACA) and the IT Governance Institute (ITGI). It defines goals for the controls that should be used to properly manage IT and to ensure that IT maps to business needs. CobiT is broken down into four domains: Plan and Organize, Acquire and Implement, Deliver and Support, and Monitor and Evaluate.
Incorrect Answers:
A: Maintain and Implement is not one of the four domains; it should be Acquire and Implement.
B: Support and Purchase is not one of the four domains; it should be Deliver and Support.
C: This answer is missing the first domain, Plan and Organize.
References:
Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, New York, 2013, p. 55

The TCP/IP protocol model is similar to the OSI model but it defines only four layers: Application Host-to-host Internet Network access
Reference(s) used for this question: http://www.novell.com/documentation/nw65/ntwk_ipv4_nw/data/hozdx4oj.html and KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, John Wiley & Sons, 2001, Chapter 3: Telecommunications and Network Security (page 84).
also see: http://en.wikipedia.org/wiki/Internet_Protocol_Suite#Layer_names_and_number_of_layers_in_the _literature