The common types of water-cooled condensers used in refrigeration systems are:
1. the shell and tube
2. the shell and coil
3. the double tube
4. the plate surface
a) 1, 2, 3
b) 1, 3, 4
c) 2, 3, 4
d) 1, 2, 4
e) 3, 4
Answer: A