If a triangle is right angled at \( B \), then the diameter of the incircle of the triangle, is ...

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If a triangle is right angled at \( B \), then the diameter of the incircle of the triangle, is
(A) \( c+a-b \)
(B) \( c+a-2 b \)
(C) \( 2(c+a-b) \)
(D) \( c+a+2 b \)
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