I dont understand these questions please help

1. Which of the following is an example of a manufacturing overhead cost? Wages paid to security personnel at the corporate office building a. b. The cost of electricity used to run the oven in which Domino's bakes it pizzas c. Cost of shipping product to customers d. The salary of the president of the company 2. A manufacturing company prepays its insurance coverage for a three-year period. The premium for the three years is $3,780 and is paid at the beginning of the first year. Eighty percent of the premium applies to manufacturing operations and twenty percent applies to selling and administrative activities. What amounts should be considered product and period costs respectively for the first year of coverage? Product Period A)S3,780 $0 B)$3,024 $756 C$2,016 $504 D)$1,008 $252 Option A . b. Option B c. Option C d. Option D 3. Jimmy Corporation uses the weighted-average method in its process costing system. The ending work in process inventory consists of 16,000 units. The ending work in process inventory is 100% complete with respect to materials and 70% complete with respect to labor and overhead. If the cost per equivalent unit for the period is $4.50 for material and $1.70 for labor and overhead, what is the balance of the ending work in process inventory account? a. $71,500 b. $82,540