Which Safety System(s)is (Are)found at Station Outlets of a Medical

Which safety system(s) is (are) found at station outlets of a medical gas piping system?
1) Diameter Index Safety System (DISS)
2) American Standard Safety System (ASSS)
3) Pin Index Safety System
4) Quick Connect

A) 1
B) 1 and 4
C) 2 and 3
D) 2 and 4