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Let a,b,c be the sides fo a triangle whe...

Let a,b,c be the sides fo a triangle where `anebnec` and `lamdainR`,if roots of the equation `x^2+2(a+b+c)x+3lamda(ab+bc+ca) =0` are real, then

A

`lamdalt4/3`

B

`lamdagt5/3`

C

`lamdain(1/3,5/3)`

D

`lamdain(4/3,5/3)`

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The correct Answer is:
A
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