Which of the following statements are correct? Statement-I: A period will be considered short-run period if the amount of at least one of the inputs…

Which of the following statements are correct? Statement-I: A period will be considered short-run period if the amount of at least one of the inputs used remains unchanged during that period. Statement-II: The long run is a period of time in which all factors of production are variable. Statement-III: In the short run all inputs are fixed. Statement-IV: In the long run all inputs except one are fixed.