If 2x-y+1=0 is a tangent to the hyperbo...

If `2x-y+1=0` is a tangent to the hyperbola `(x^2)/(a^2)-(y^2)/(16)=1` then which of the following CANNOT be sides of a right angled triangle? (a)`a ,4,2` (b) `a ,4,1` (c)`2a ,4,1` (d) `2a ,8,1`

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