You Are Using a Gigabit Ethernet Adapter (Vmnic1) on an ESXi

You are using a gigabit Ethernet adapter (vmnic1) on an ESXi host, and you have found that the status screen displays the adapter as being connected at 100 Mb, full duplex. You have verified that the switch your server connects to has 1 Gbps capable ports. What is most likely the problem?

A) The adapter has been manually configured to a speed of 100 Mb, duplex operation.
B) The adapter's driver in ESXi does not have 1 Gbps capability.
C) The cable connecting the server and switch is damaged.
D) The virtual machine using vmnic1 has limited the speed of the interface.