Which of the following describes the distinctive characteristic of weighted-average computations in assigning costs to units completed and to units in ending work in process? a. calculates the equivalent unit cost of all the work done to date and assigns this cost to equivalent units completed and transferred out of the process, and to equivalent units in ending work-in-process inventory. b. assigns the cost of the previous accounting period's equivalent units in beginning work-in-process inventory to the first units completed and transferred out of the process and assigns the cost of equivalent units worked on during the current period first to complete beginning inventory, next started and completed new units, and finally to units in ending work-in-process inventory. c. standard costs are assigned first to complete beginning work-in-process inventory, next started and completed new units, and finally to start new units that are in ending work-in-process inventory. d. none of the above.