Which is the graph of f (x) = f (one-half) superscript x?

on a coordinate plane, an exponential decay function decreases from quadrant 2 into quadrant 1 and approaches y = 0. it crosses the y-axis at (0, 4) and goes through (1, 1).

on a coordinate plane, an exponential decay function decreases from quadrant 2 into quadrant 1 and approaches y = 0. it crosses the y-axis at (0, 4) and goes through (2, 1).

on a coordinate plane, an exponential decay function decreases from quadrant 2 into quadrant 1 and approaches y = 0. it crosses the y-axis at (0, 2) and goes through (1, 1).

on a coordinate plane, an exponential decay function decreases from quadrant 2 into quadrant 1 and approaches y = 0. it crosses the y-axis at (0, 2) and goes through (1, 0.5).