What is a possible cause for the connection problem?

Jordan’s company is streaming training videos provided by a third party on the internet. Jordan configures NGX, so that each department only views Webcasts specific to its department. Jordan created and configured the multicast groups for all interfaces, and configures them to "Drop all multicast packets expect those whose destination is in the list". However, no multicast transmissions are coming from the internet. What is a possible cause for the connection problem?

A.
The Multicast Rule is below the Stealth Rule. NGX can only pass multicast traffic, if the Multicast Rule is above the Stealth Rule

B.
Jordan did not create the necessary "to and through" rules, defining how NGX will handle the multicast traffic

C.
Multicast groups are configured improper~ on the external interface properties of the Security Gateway object

D.
Antispoofing is enabled. NGX cannot pass multicast traffic, if antispoofing is enabled

E.
NGX does not support multicast routing protocols and streaming media through the Security Gateway

Explanation:
Not E: N GX doesn’t support multicast? That’s quite obviously not true.

http://www.checkpoint.com/ngx/upgrade/top10.html