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a,b,c are the lengths of the sides of a non-degenerate triangle , If `k = (a^2 + b^2 + c^2)/(bc + ca + ab)` , then

A

`k lt 1`

B

`k gt 2`

C

`1 le k le 2`

D

`1 le k lt 2`

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The correct Answer is:
D
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