I've got 3 as well, for the reasons given above. Although I am not entirely convinced that named pipes is a protocol per se, but since it can be used to communicate with SQL Server over a network, I guess it comes down to the definition of network protocol (or just protocol for that matter).
MARCUS. Why dost thou laugh? It fits not with this hour.
TITUS. Why, I have not another tear to shed;
--Titus Andronicus, William Shakespeare