The answer is D. (1,4). A coordinate is (x, y). You get the answer by plugging the 1 in 4^x. When you work out the problem you will get 4. And that matches the answer in D. f(x) is y in a coordinate. If you see the answer in letter C it won’t work because when you plug in 4 in 4^x you get 256. The answer doesn’t match y in the coordinate in answer C because the answer in C is 1 instead of 256.
^ means exponent
Hope that helps. :)
