f(x)=√x-5. Find f¹(x) and its domain.
O A. f-¹(x) = x² +5; x≥0
O B. f¹(x) = (x + 5)²; x≥ −5
O c. f¹(x) = x² + 5; x≥ −5
O D. f¹(x) = (x + 5)²; x ≥ 0