A large manufacturer of domestic electric ovens  wants to explore more energy-efficient means for cooking with electricity. The baseline is the standard oven with electric heating elements having a volume sufficient to hold a 9-kg turkey. Investigate microwave heating, radiant elements, convection-assisted heating or any other reasonable concepts or combinations of concepts that improve the efficiency. You may also want to consider how the unit is insulated and how it is internally vented. Although the cost of the oven is important, energy consumption, reliability, and speed of cooking are the primary concerns for this design.