The two broad classifications of plastic piping are:
1. Thermoplastics
2. Thermosets
3. Polyvinal Chloride
4. Polyethelyne
5. Acrylonitrile Butadience Styrene
6. Polybutylene
7. Chlorinated Polyvinyl Chloride
a) 1, 2
b) 3, 4
c) 5, 6
d) 1, 7
e) 3, 5
Answer: A