Which action increases server availability？（）

A. configuring a second network card with a different IP address
B. replacing the existing 100 Mbps NIC with a gigabit Ethernet NIC
C. using adapter teaming and configuring the second network card with the same IP address as the first network card
D. 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