Color coding shall be permitted to identify intrinsically safe conductors where they are colored $?$ and where no other conductors colored light blue are used. Likewise, color coding shall be permitted to identify raceways, cable trays, and junction boxes where they are colored $q,$ and contain only intrinsically safe wiring.

a$.$ blue $/$ blue

b$.$ light blue $/$ light blue

c$.$ light purple $/$ light purple

d$.$ purple $/$ purple