F(x)= sqrt x-5 find f -1
A.
f ­-1 (x) = (x + 5)2; y > 5

B.
f­-1 (x) = x2 +25; y> 25

C.
f ­-1 (x) = x2 + 5; y > 5

D.
f­-1 (x) = x2 +25; y> 5