You are using logical systems to segregate customers. You have a requirement to enable
communication between the logical systems. What are two ways to accomplish this goal? (Choose
two.)

A.
Use a shared DMZ zone to connect the logical systems together.

B.
Use a virtual tunnel (vt-) interface to connect the logical systems together.

C.
Use an external cable to connect the ports from the two logical systems.

D.
Use an interconnect LSYS to connect the logical systems together.

Explanation:

Reference :http://www.juniper.net/techpubs/en_US/junos11.4/information-products/topiccollections/security/software-all/logical-systems-config/index.html?topic-53861.html