Identify the functions of the tegument:

I- Mechanical and thermal protection.
II- Cutaneous sensitivity.
III- Respiratory function.
IV- Osmoregulatory function.
V- Excretory function.
VI- Thermal regulation.
a) I, II, III and IV are correct.
b) I, II, IV and V are correct.
c) I, II, V and VI are correct.
d) II, III, IV and V are correct.