What is the Law of Thermal Equilibrium?

I- If two objects A and B, considered separately, are in thermal equilibrium with a third object C, then A and B are in thermal equilibrium with each other.
II- Two objects are in thermal equilibrium if they have the same temperature.
III- The temperature of an object is determined by the amount of energy it contains.
a) I and II are correct.
b) II and III are correct.
c) I and III are correct.