C seems to be correct according to - FortiAnalyzer Analyst Study Guide for FortiAnalyzer 7.2
FortiSIEM: SIEM collector functionality only. Must be registered on a licensed FortiSIEM
Supervisor
MEA - Administration Guide, FortiSIEM 6.7.5
To run the FortiSIEM Collector management extension application, the following requirements must be met:
FortiAnalyzer 7.0.1 or above
FortiSIEM Supervisor, Worker, Collectors 6.3.0 or above.
FortiSIEM Linux Agent 6.3.0 or above.
FortiSIEM Windows Agent 4.1.2 or above.
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