Decide whether the following equation defines y as a function of x. y=20√x Does the given equation define y as a function of x?
A. No, because for some values of x there is no value of y.
B. Yes, because each value of x leads to a unique value of y.
C. No, because for some values of x there are two values of y.
D. Yes, because each value of y leads to a unique value of X.