Which configuration is necessary to enable the Jabber persistent chat feature on mobile devices?

The persistent chat feature is configured in a Cisco Jabber deployment that is running Cisco Unified IM and Presence 11.5 SU6. Desktop clients are working, but mobile clients are not displaying persistent chats. Which configuration is necessary to enable the Jabber persistent chat feature on mobile devices?
A. add the true line to the Jabber configuration file that is used by mobile devices
B. add “Enable_Persistent_Chat” in the “Cisco Support Field” on the Jabber for mobile device configuration page on Cisco UCM
C. add the false line to the Jabber configuration file that is used by all Jabber devices
D. while logged into IM and Presence server Administration, go to “Messaging”, then “Settings”, and check the checkbox for the “Enable persistent chat for mobile” field