Laws of motion

If, in Exercise 4.21, the speed of the stone is increased beyond the maximum permissible
value, and the string breaks suddenly, which of the following correctly describes the
trajectory of the stone after the string breaks :
(a) the stone moves radially outwards,
(b) the stone flies off tangentially from the instant the string breaks,
(c) the stone flies off at an angle with the tangent whose magnitude depends on the
speed of the particle ?