To correctly proceed with hair coloring application, it is essential that the professional knows which root touch-up procedure should be used accor...

To correctly proceed with hair coloring application, it is essential that the professional knows which root touch-up procedure should be used according to each parameter. Choose the correct alternative:

Hair chemically processed without apparent grown root.
1cm of grown root of the hair, which benefits from the natural temperature of the scalp.
Hair with more than 30% of white hair at the root.
A hair with 4cm of grown root.
100% white or resistant white hair.
a) 1 and 2 are correct.
b) 2 and 3 are correct.
c) 3 and 4 are correct.
d) 4 and 5 are correct.
e) Only alternative 2 is correct.