which statement is correct?

You have a group IPsec VPN established with a single key server and five client devices. Regarding this
scenario, which statement is correct?

A.
There is one unique Phase 1 security association and five unique Phase 2 security associations used for
this group.

B.
There is one unique Phase 1 security association and one unique Phase 2 security association used for this
group.

C.
There are five unique Phase 1 security associations and five unique Phase 2 security associations used for
this group.

D.
There are five unique Phase 1 security associations and one unique Phase 2 security association used for
this group.

Explanation:
http://www.thomaskrenn.com/redx/tools/mb_download.php/mid.x6d7672335147784949386f3d/Manual_Configuring_Gro
up_VPN_Juniper_SRX.pdf