If you're simply looking for a replacement driver to access tags in the PLC, you need the Generic EtherNet/IP Client Device. I believe the other 2 are for directly connecting to I/O (I think this is the first option - EtherNet/IP Class 1 Host Device), and for simulating a "virtual rack" to allow a PLC/scanner/ethernet card to connect the virtual rack and treat it like I/O.