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Let $a,b,c$ be positive real numbers .Let $\theta=\tan^{-1}\sqrt{\large\frac{a(a+b+c)}{bc}}+$$\tan^{-1}\sqrt{\large\frac{b(a+b+c)}{ca}}$$+\tan^{-1}\sqrt{\large\frac{c(a+b+c)}{ab}}$.Then $\tan\theta$

$(a)\;\pi\qquad(b)\;\large\frac{\pi}{2}$$\qquad(c)\;2\pi\qquad(d)\;None\;of\;these$

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