Select the correct answer. Exponential function f is represented by the table.

Function g is an exponential function passing through the points (0,9) and (3,0).

Which statement correctly compares the two functions?

A.
Only function g is decreasing on [0, 3], and only function f is positive on that interval.
B.
Both functions are decreasing on [0, 3], and function f is decreasing at a faster rate.
C.
Only function f is decreasing on [0, 3], and both functions are positive on that interval.
D.
Both functions are decreasing on [0, 3], and function g is decreasing at a faster rate.