In a \( \triangle \mathrm{ABC} \), following relations hold good. In which case(s) the triangle ...

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In a \( \triangle \mathrm{ABC} \), following relations hold good. In which case(s) the triangle is a right angled triangle?
(A) \( r_{2}+r_{3}=r_{1}-r \)
(B) \( a^{2}+b^{2}+c^{2}=8 R^{2} \)
(C) \( r_{1}=s \)
(D) \( 2 R=r_{1}-r \)
\( \mathrm{P} \)
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