Describe how a liquid penetrant examination should be performed in order to detect discontinuities, which are open to the surface :-

clean the part, apply the developer, apply the penetrant, remove excess penetrant, inspect the part, clean the part;

clean the part, apply the penetrant, remove excess penetrant, apply the developer, inspect the part, clean the part;

clean the part, apply the developer, apply the penetrant, inspect the part, remove excess penetrant, clean the part;

clean the part, apply the developer, apply the penetrant, inspect the part, clean the part.