Which statement is true about real-time objects in an SRX chassis cluster?

Which statement is true about real-time objects in an SRX chassis cluster?

A.
Real-time objects are exchanged over the fxp1 link to provide highly accurate time synchronization.

B.
Real-time objects are exchanged over the fxp1 link to synchronize IPsec security associations.

C.
Real-time objects are exchanged over the fab links to provide configuration file synchronization.

D.
Real-time objects are exchanged over the fab links to synchronize session table entries.