Equation of the tangents to the ellipse ...

Equation of the tangents to the ellipse `x^2/9 + y^2/16 = 1` which are parallel to the line `x+y+1=0` are (A) `x+y+5=0` (B) `x+y-5=0` (C) `x+y+6=0` (D) `x+y-6=0`

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