The directrix is the purple line , C , Option C is the answer.
What is Directrix ?
A directrix is a perpendicular line to the axis of symmetry of a hyperbola , the hyperbola moves away from the directrix and directrix is useful in construction of a hyperbola.
A hyperbola is set of all points in a plane , it is equidistant form a single point called as focus and a single caalled as Directrix.
From the given figure it can be seen that the directrix is the purple line , C , Option C is the answer.
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