Which of the following statements is appropriate as per first law of thermodynamics?

The First Law of Thermodynamics is a statement of the conservation of energy. It says:
Energy cannot be created or destroyed; it can only be transferred or transformed from one form to another.
In the context of thermodynamics:
- The energy of a system can change due to heat transfer \((Q)\) or work \((W)\) done by/on the system. This is mathematically expressed as:
\(\Delta U=Q-W\)
where \(\Delta U\) is the change in internal energy of the system.
However, if we consider the system and surroundings together (the universe), the total energy remains constant because energy lost by the system is gained by the surroundings, and vice versa.