Which of the following are elements of a mechanical purging system?
1. purge pickup tube
2. purge chamber
3. manual shutoff valve
4. safety solenoid valve
5. oil trap
6. vacuum pump
a) 1, 2
b) 4, 6
c) 1, 3, 5
d) 1, 2, 5
e) all of the elements
Answer: E