Which two are correct when configuring an IP address for a Fast Ethernet interface?（）

A.Units in JUNOS are always required for any interface configured with logical addresses such as IP and IPv6.
B.Units in JUNOS are only required when you are configuring sub-interfaces for inter-VLAN routing.
C.Unit numbers must match the DLCI or VCI numbers configured on the interface.
D.Unit 0 is the only value allowed on interfaces running HDLC, PPP, or for Ethernet interfaces not doing VLAN-tagging.

A.set interfaces fe-0/0/0 unit 0 ethernet-options mtu 1200
B.set interfaces fe-0/0/0 mtu 1200
C.set interfaces fe-0/0/0 unit 0 mtu 1200
D.set interfaces fe-0/0/0.0 mtu 1200

A.Layer 1 on the interface is up but Layer 2 is down.
B.Layer 2 on the interface is up but Layer 3 has not been configured.
C.The interface is administratively up but the link status is down.
D.The interface is up but has been administratively turned off.