What are the common set of Ethernet Transmission speeds?

A.
100 Mbps, 1Gbps and 2 Gbps

B.
20 Mbps, 200 Mbps and 2Gbps

C.
10 Mbps, 100 Mbps and 1Gbps

D.
1 Mbps, 10 Mbps and 100 Mbps