Correct option is A
Cutback bitumen is a type of bitumen that is obtained when viscosity is reduced by volatile diluent. It is generally used in colder regions.
Different types of cutback bitumen are:
Rapid curing cutback (RC): In this bitumen is fluxed with NAPTHA/GASOLINE
Medium curing cutback (MC): In this bitumen is fluxed with KEROSENE
Slow curing Cutbcak (SC): In this bitumen is fluxed with high boiling point diluent.
MC and SC cutbacks are used for priming.
RT - 1 is the lowest viscosity used for surface painting
RT - 4 used for premix in macadam.
RT - 5 is used for grouting which has the highest vis
