To get the most accurate results on the security posture of a system, which of the following actions should the security analyst do prior to scanning?
a) log all users out of the system
b) patch the scanner
c) reboot the target host
d) update the plugins

B) Patch the scanner.

Explanation:

To get the most accurate results in the security posture of  a system the security analyst should first patch the scanner before scanning.

Patch is the set of changes the program or the data to update,improve or fix it.

In our case we are going to use a scanner.

Hence the answer to this question is option B.