The above diagram shows the paths of the beams that travel from the top of the object to the biconcave lens on the right. The beam **X** enters the center of the lens and then goes in a straight line without changing directions. The beam **Y** initially travels towards the point **P'** on the right of the lens, but travels parallel to the lens axis after passing through the lens. The beam **Z** travels towards the point **P** on the left of the lens. The points **P** and **P'** are symmetric with respect to the center of the lens. Which of the following statements is correct?

a) The point **P'** is one of the focal points of the biconcave lens.

b) The beam **Z** travels parallel to the lens axis after passing through the lens.

c) The image of the object is placed between the lens and the object.

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