A) \[a=b=c;\,\alpha =\beta =\gamma =90{}^\circ \]
B) \[a=b\ne c;\,\alpha =\beta =\gamma =90{}^\circ \]
C) \[a\ne b\ne c;\,\alpha =\beta =\gamma =90{}^\circ \]
D) \[a=b=c;\,\alpha =\beta =\gamma \ne 90{}^\circ \]
Correct Answer: B
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