If the equation of one tangent to the circle with centre at $(2, -1)$ from the origin is $3x + y = 0$, then the equation of the other tangent through the origin is
If the equation of one tangent to the circle with centre at $(2, -1)$ from the origin is $3x + y = 0$, then the equation of the other tangent through the origin is
- A
$3x - y = 0$
- B
$x + 3y = 0$
- C
$x - 3y = 0$
- D
$x + 2y = 0$
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