What are some of the most common vulnerabilities that exist in a network or system?

Q. What are some of the most common vulnerabilities that exist in a network or system?

A.            Changing manufacturer, or recommended, settings of a newly installed application

B.            Additional unused features on commercial software packages

C.            Utilizing open source application code

D.            Balancing security concerns with functionality and ease of use of a system

Answer: Additional unused features on commercial software packages