If antivirus, grayware, and heuristic scans are enabled on FortiGate, in which order does FortiGate apply the scanning?

If antivirus, grayware, and heuristic scans are enabled on FortiGate, in which order does FortiGate apply the scanning?

Response:
A . heuristics -> grayware -> antivirus
B . antivirus -> grayware -> heuristics
C . antivirus -> heuristics -> grayware
D . grayware -> antivirus -> heuristics

Answer: B