Noelle rides her bike at an average speed of 0.25 miles per minute, and the distance function is d(x) = 0.25x. What is the correct inverse of this function, and what does the input and output represent?
a) Inverse: d⁻¹(x) = 4x, interpreted as time in minutes to cover distance x in miles
b) Inverse: d⁻¹(x) = x/0.25, interpreted as distance x in miles covered in time in minutes
c) Inverse: d⁻¹(x) = 0.25/x, interpreted as time in minutes to cover distance x in miles
d) Inverse: d⁻¹(x) = 1/0.25x, interpreted as distance x in miles covered in time in minutes