The value of a certain house is modeled by the function where x represents the number of years since it was bought. Which statement is true?
A. The initial cost of the house is $2,500.
B. The value of the house will increase to $126,000 over a period of time.
C. The initial cost of the house is $126,000, and the value is decreasing by $2,500 every year.
D. The initial cost of the house is $126,000, and the value is increasing by $2,500 every year.