Final answer:
A Protocol analyzer is the best tool to use when confirming if data exfiltration is occurring because it allows for the inspection of data packets to detect unauthorized transmission of sensitive information.
Step-by-step explanation:
The question relates to identifying the appropriate tool to confirm if data exfiltration is occurring by analyzing network traffic. Among the tools listed, a Protocol analyzer is the correct choice. Protocol analyzers, also known as network analyzers or packet sniffers, can inspect the data packets in real-time or from log files, enabling a security analyst to look deep into the packet payloads to detect if there is any sensitive data being transmitted in an unauthorized manner. A Protocol analyzer will help discern the nature of the traffic and verify if sensitive information is being compromised.
A Port scanner is useful for detecting open ports and services but does not analyze the content of network traffic. An SCAP tool (Security Content Automation Protocol) helps in automating the monitoring of system security but is not designed for analyzing network traffic content. A File integrity monitor checks for unauthorized changes to files but does not monitor live network traffic for potential data exfiltration.