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Let C1 and C2 be respectively, the para...

Let `C_1` and `C_2` be respectively, the parabolas `x^2=y-1` and `y^2=x-1` Let P be any point on `C_1` and Q be any point on `C_2` . Let `P_1` and `Q_1` be the refelections of P and Q, respectively with respect to the line y=x.
Arithemetic mean of `PP_1`and `Q Q_1` is always less than

A

PQ

B

`1/2`PQ

C

2PQ

D

`3/2`PQ

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The correct Answer is:
A
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