A concave mirror is placed on a horizontal table with its axis directed vertically upwards. Let ...

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A concave mirror is placed on a horizontal table with its axis directed vertically upwards. Let \( O \) be the pole of the mirror and \( C \) its centre of curvature. A point object is placed at \( C \). It has a real image, also located at \( C \). If the mirror is now filled with water, the image will be
(A) Real, and will remain at \( C \)
(B) Real, and located at a point between \( C \) and \( \infty \)
(C) Virtual and located at a point between \( C \) and \( O \)
(D) Real, and located at a point between \( C \) and \( O \)
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