what is the exact sequence in which the mappings related fact are loaded?

Considering loading a fact named w_xxx_A, what is the exact sequence in which the mappings
related fact are loaded?

A.
SDE -> PLP-> SIL

B.
SDE -> SIL -> PLP

C.
SIL -> SDE -> PLP

D.
PLP-> SIL -> SDE

Explanation:
The correct sequence is SDESILPLP