What are two characteristics of Frame Relay point-to-point subinterfaces? (Choose two.)

A.
They create split-horizon issues.

B.
They require a unique subnet within a routing domain.

C.
They emulate leased lines.

D.
They are ideal for full-mesh topologies.

E.
They require the use of NBMA options when using OSPF.

Explanation:
http://www.ciscopress.com/articles/article.asp?p=170741&seqNum=5
Configuring Frame Relay Subinterfaces On partially meshed Frame Relay networks, the problem of
split horizon can be overcome by using Frame Relay subinterfaces. Frame Relay provides a
mechanism to allow a physical interface to be partitioned into multiple virtual interfaces. In a similar
way, using subinterfaces allows a partially meshed network to be divided into a number of smaller,
fully meshed point-topoint networks. Generally, each point-to-point subnetwork is assigned a
unique network address. This allows packets received on one physical interface to be sent out from
the same physical interface, albeit forwarded on VCs in different subinterfaces. There are two types
of subinterfaces supported by Cisco routers: point-to-point and multipoint subinterfaces.