The correct answer is: D. Both (A) and (B)
Load factor is the ratio of the average load to the installed capacity of the plant. Plant factor is the ratio of the average load to the maximum possible load. If the reserve capacity is zero, then the maximum possible load is equal to the installed capacity. Therefore, the load factor and the plant factor are equal.
Load factor is a measure of how efficiently a power plant is being used. A higher load factor indicates that the plant is being used more efficiently. Plant factor is a measure of how much of the plant’s capacity is being used. A higher plant factor indicates that the plant is being used more heavily.
Both load factor and plant factor are important metrics for power plants. Load factor is important because it affects the cost of operating the plant. Plant factor is important because it affects the reliability of the plant.