The sales function for a product is given by S(x)=99+45.6x20.8x3, where x represents thousands of dollars spent on advertising, 0x38, and S is in thousands of dollars. Find the point of diminishing returns. Enter the amount spent on advertising as well as the sales in dollars. A) Amount spent on Advertising: $38, Total Sales: $22047800 B) Amount spent on Advertising: $19000, Total Sales: $11073400 C) No point of diminishing returns D) Amount spent on Advertising: $11073400, Total Sales: $19000