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Let `a,b,c` be the sides of a triangle. No two of them are equal and `lambda in R` If the roots of the equation `x^2+2(a+b+c)x+3lambda(ab+bc+ca)=0` are real, then (a) `lambda < 4/3` (b) `lambda > 5/3` (c) `lambda in (1/5,5/3)` (d) `lambda in (4/3,5/3)`

A

`(- infty, 4//3)`

B

`(5//3, infty)`

C

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

D

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

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