Fortigate Antivirus

Hi, I am using Fortigate 60E and i want to know in Fortigate which Anti-Virus engines are used like in Security Profile we have Antivirus section but it doesn't show which Anti-Virus engines does it use to detect malware or malicious content? Is it Kaspersky, Mcafee, Symantec or any other Anti-Virus behind working?

ThankYou

Regards: Asim Raza Technical Consultant - Network Security