What is the equation of the function shown in the graph, given that the equation of the parent function is f(x)= (1/4)^{x}

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f(x)=(1/4)^{x }−4

f(x)=(1/4)^{x }−3

f(x)=(1/4)^{x }−2

f(x)=(1/4)^{x }−1

This graph is the parent function y = (1/4)^{x} shifted down 3 units

So....the correct answer is : f(x)=(1/4)^{x} −3