AHSME 1993 Problem 1

For integers $a,b,$ and $c$ define $\fbox{a,b,c}$ to mean $a^b-b^c+c^a$. Then $\fbox{1,-1,2}$ equals: $\text{(A) } -4 \text{(B) } -2 \text{(C) } 0 \text{(D) } 2 \text{(E) } 4$