What is a characteristic of MX7000 networking in Scalable Fabric Mode?

What is a characteristic of MX7000 networking in Scalable Fabric Mode?
A . Enabled by default, all switch-specific OS10EE capabilities are available.
B . Layer 2 bridging is disabled be default and interfaces must join a bridge domain (VLAN) before being to forward frames.
C . All switch interfaces are assigned to VLAN 1 by default and are in the same Layer 2 bridge domain.
D . Available on MX9116n FSE and MX7116n FEM but not on the MX5108n.

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Answer: D