Which of these statements is true about logical units on Juniper Router interfaces?

Which of these statements is true about logical units on Juniper Router interfaces?
A . A logical unit is always required.
B . Logical units are used only when a Layer 2 identifier is present such as VLA
D . Logical units are not required unless ATM or 802.1Q VLAN tagging is configured.
E . A logical unit of 0 is required when using a frame-relay DLC

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Answer: A