How does OS Fingerprinting help you as a pen tester?

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How does OS Fingerprinting help you as a pen tester?
A . It defines exactly what software the target has installed
B . It doesn’t depend on the patches that have been applied to fix existing security holes
C . It opens a security-delayed window based on the port being scanned
D . It helps to research vulnerabilities that you can use to exploit on a target system

Answer: D