Temperature is a measurement of the coldness or hotness of an object. This definition is based on:

The internal energy of a system depends on what?

In a cyclic process, the internal energy of the gas

Is it necessary to change the volume and pressure to bring the equilibrium of a system? Why?

Two gases are said to be in thermal equilibrium when they have the same:

Assertion $(A)$: The zeroth law of thermodynamics leads to the concept of temperature.
Reason $(R)$: The zeroth law states that two systems in thermal equilibrium with a third system are in thermal equilibrium with each other.
The correct option among the following is: