Kind of off topic but....

I was wondering about Ethernet connections. Namely, 10Mbps vs. 100Mbps and Half-Duplex vs. Full Duplex. Are these two things independant from each other? What I mean is can you have four different combinations like 10Mbps Half Duplex, 10Mbps Full Duplex, 100Mbps Half Duplex, and 100Mbps Full Duplex?

Or is it only two? Like 10Mbps is only Half Duplex and 100Mbps is Full Duplex?

Thanks in advance...