`f(x)={4x-x^3+ln(a^2-3a+3),0lt=x<3x-18 ,xgeq3` complete set of values of `a` such that `f(x)` as a local minima at `x=3` is `[-1,2]` `(-oo,1)uu(2,oo)` `[1,2]` (d) `(-oo,-1)uu(2,oo)`