If joint products end up with the same gross margin percentage, which of the following is TRUE? Question $28$Select one: a$.$ The estimated net realizable method must have been used. b$.$ The physical measure method must have been used. c$.$ The cost allocation method assigned the same cost per unit to each product. d$.$ If all products are sold at the splitoff point, and there were no opening inventories, the sales value at splitoff method could have been used. e$.$ The gross margin percentage NRV method must have been used.