The ordinary differential equation (1 − 𝑥^2)𝑦′′ − 𝑥𝑦′ + 9𝑦 = 0

Gate Physics Differential Equations :

The ordinary differential equation
(1 − 𝑥^2)𝑦′′ − 𝑥𝑦′ + 9𝑦 = 0
has a regular singularity at

(A) −1
(B) 0
(C) +1
(D) no finite value of x