the corret
(b) duramater $\rightarrow$ aracmion $\rightarrow$ piamater $\rightarrow$ arachnoid membrane
(b) durmater
1d piamater $\rightarrow$ arachnoid membrane $\rightarrow$ duramater
(0) arachnoid membrane $\rightarrow$ duramater $\rightarrow$ piamater.