Identify the correctly matched pair(s) from the following based on the type of cut-back bitumen and fluxing agents used.
1. Rapid curing (RC) cut-backs : Kerosene
2. Medium curing (MC) cut-backs : Naptha or gasoline
3. Slow curing (SC) cut-backs : light oils
1
Only 1 and 2
2
Only 1
3
Only 1 and 3
4
Only 3