Refer to the exhibit.

When running EIGRP, what is required for RouterA to exchange routing updates with RouterC?

A.
AS numbers must be changed to match on all the routers

B.
Loopback interfaces must be configured so a DR is elected

C.
The no auto-summary command is needed on Router A and Router C

D.
Router B needs to have two network statements, one for each connected network

Explanation:

Here we required same autonomous system between router A,B,C.Routing updated always
exchange between in same EIGRP EIGRP autonomous system.you can configure more than one
EIGRP autonomous system on the same router. This is typically done at a redistribution point where
two EIGRP autonomous systems are interconnected. Individual router interfaces should only be
included within a single EIGRP autonomous system. Cisco does not recommend running multiple
EIGRP autonomous systems on the same set of interfaces on the router. If multiple EIGRP
autonomous systems are used with multiple points of mutual redistribution, it can cause
discrepancies in the EIGRP topology table if correct filtering is not performed at the redistribution
points. If possible, Cisco recommends you configure only one EIGRP autonomous system in any
single autonomous system.
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f07.shtml