A6. Which of the following signs can you insert into the square to make the statement $( -1$)^{-8} \square 1 \cdot 1 \cdot 1 \cdot 1$ correct?
$(\mathbf{A})$
$(\mathbf{C}) \leq$
$(\mathbf{D}) \neq$
(E) none of the above
A6. The expression $(-1)^{-8}$ and $1 \cdot 1 \cdot 1 \cdot 1$ both have the value 1. The statement is correct if we place the sign $\leq$ in the square.