Which of the following measures is a preventive measure?

A.
Installing a logging system that enables changes in a system to be recognized

B.
Shutting down all internet traffic after a hacker has gained access to the company systems

C.
Putting sensitive information in a safe

D.
Classifying a risk as acceptable because the cost of addressing the threat is higher than the value of the information at risk

Explanation:
Prevention makes it impossible for the threat to occur.
Examples in IT security are: disconnect Internet connections and internal network connections.
In physical security: closing doors to prevent people entering the building, though this countermeasure is not very practical. There are other preventive measures that are more practical. For example, placing sensitive information after office hours in a safe. Another example is video surveillance with stickers on the windows informing people they are being monitored.