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Let a,b,c be the sides of a triangle. No...

Let a,b,c be the sides of a triangle. No two of them are equal and `lamda in R` If the roots of the equation
`x ^(2) +2 (a+b+c)x+3 lamda (ab+bc+ca)=0` are real distinct, then

A

`lamda lt (4)/(3)`

B

`(11)/(3) lt lamda lt (17)/(3)`

C

`(11)/(6) lt lamda lt (15)/(4)`

D

`lamda ge 1`

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A
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