If f(x)=(t+3x-x^2)/(x-4), where t is a p...

If `f(x)=(t+3x-x^2)/(x-4),` where `t` is a parameter that has minimum and maximum, then the range of values of `t` is (a) `(0,4)` (b) `(0,oo)` (c) `(-oo,4)` (d) `(4,oo)`

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