What is the first step in an Anti-Virus scan-on-write operation?

A.
EMC’s Antivirus agent will employ the 3rd party AV Engine (the anti-virus software) to scan the file

B.
The VC Client (on the blade) triggers a request (with the UNC path name of the file) to the AV server to scan the file

C.
Client writes a file and saves to the VNX/VNXe cashe

D.
Upon the success of the operation the VC client can save the file to the backend storage