Chris was the business manager for a real estate firm earning an annual salary of $40,000. Then Chris decided to become a consultant. Chris hired an administrative assistant at $25,000 per year and rents office space (utilities included) for $36,000 per year. Chris earned $100,000 in total revenue the first year as a consultant.What is Chris's explicit annual cost? A. $15,000B. $12,000C. $36,000D. $51,000