Which action increases server availability?

Which action increases server availability?

A.
installing a dual-port network card that can handle the future growth and setting one NIC to 10 Mbps and one NIC to 100 Mbps

B.
replacing the existing 100 Mbps NIC with a gigabit Ethernet NIC

C.
configuring a second network card with a different IP address

D.
using adapter teaming and configuring the second network card with the same IP address as the first network card