A machine must have the most direct access possible to two different networks.  However， it cannot act as a router between the networks.  Which of the following arrangements is most appropriate to facilitate the machine’s accessibility？（）

A.ipforwarding turned on and two adapters
B.One adapter， with a route to a default gateway
C.An adapter in each network， and ipforwarding off
D.An adapter in each network， with a route only to the default gateway