What is the general form of the particular solution guaranteed to exist of the linear nonhomogeneous recurrence relation
$a_n$=$6a_{n-1}$-$12a_{n-2}$+$8a_{n-3}$+F(n) if
- F(n)=$n^2$
- F(n)=$2^n$
- F(n)=$n2^n$
- F(n)=$(-2)^n$
- F(n)=$n^22^n$
- F(n)=$n^3(-2)^n$
- F(n)=3