The following statements are given for a stationary wave:
a. Every particle has a fixed amplitude which is different from the amplitude of its nearest particle.
b. All the particles cross their mean position at the same time.
c. All the particles are oscillating with the same amplitude.
d. There is no net transfer of energy across any plane.
e. There are some particles that are always at rest.
Choose the correct alternatives:
1. (a, b, d, e)
2. (a, c, d, e)
3. (b, c, d)
4. (c, d, e)