Identify the complete and correct statement of the first law of thermodynamics

• A. During a process, extracting work without supplying heat, while sacrificing the energy of the system.
• B. Difference between the heat and work interactions during a process, which is property of the system.
• C. When a closed system executes a complete cycle, the sum of heat interactions is equal to the sum of work interactions.
• D. When a system undergoes a cycle, the integral of heat is equal to the integral of work.