The largest integral value of k for whic...

The largest integral value of k for which the equation `(x-1)(x-2)(x-3)(x-4)+k=0` has real roots is a root of the equation (a)`x^2-3x+2=0` (b) `x^2+3x+2=0` (c)` x^2-7x+12=0` (d)`x^2+7x+12=0`

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