The quantity of heat required to take a system from \(\mathrm{A}\) to \(\mathrm{C}\) through the process \(\mathrm{ABC}\) is \(20\) cal. The quantity of heat required to go from \(\mathrm{A}\) to \(\mathrm{C}\) directly is:
| 1. | \(20\) cal | 2. | \(24.2\) cal |
| 3. | \(21\) cal | 4. | \(23\) cal |