If a company employs IT inventory techniques, which statement is true?

$4)$ Variable and fill costing income wil differ very little since there is almost no inventory on hand.

B$)$ Variable and full costing income will differ very little since there are almost no fixed costs incurred on production.

C$)$

Variable and full costing income will differ greatly since actual costs are difficult to determine.

D$)$ Variable and full costing income will differ greatly since there will be a large difference between gross margin and contribution margin.