Which of the following solutions should an administrator use to reduce the risk from an unknown vulnerability in a third-party software application? A. Sandboxing
B. Encryption
C. Code signing
D. Fuzzing

A. Sandboxing

Explanation:

The best solution to apply for this task would be Sandboxing. This is a software management strategy that isolates applications from critical system resources and other programs. In doing so you effectively add a secondary security layer on top of the application in order to prevent any and all malware from entering and damaging your overall system. Thus effectively reducing the risk.

i think the answer would be a