A firm uses the pure level strategy for aggregate planning activities. A predicted demand set of the company for the next planning periods (from Period /+1 to 1+4) is assumed as to be 120, 15, 45, and 90 units. Additionally, we know that company has produced 60 units in Period (1-1). Please select one or more convenient option(s) for the company while the pure level strategy is being applied within the firm strictly. (Please explicitly explain your ideas, calculations, etc. for any selected option(s)) a. Company will hire workers to fulfill production of 120 units in Period (+1) b. Company will layoff some of their workers in at least two periods. c. Maximum level of inventory will be 30 units in the next four periods d. Level of inventory will decrease around 15 units at the end of Period (+3) e. Company will change its workforce each quarter so that inventory does not change f. None of the above (If this option is selected, please indicate potential solutions)