Fuel reforming is $...($Select all correct answers$).(15$p$)$

a$.$ used in the production of green, blue, and gray hydrogen.

b$.$ used to extract hydrogen from hydrocarbon fuels which has hydrogen in their chemical composition.

c$.$ consist of multiple processes: desulfurization, steam reforming, water gas shift and clean up$.$

d$.$ Converts a hydrocarbon fuel to only water and hydrogen.