Consider the following properties for plastics:
1. Become hard on heating
2. Increasing plasticity
3.Ability to deform with rise in temperature
4. Long chain structure
Which of these properties for plastics are correct?
(a) 1, 2, 3 and 4 (b) 3 and 4 only
(c) 1 and 4 only (d) 2, 3 and 4 only