# If $A = \begin{bmatrix} 0 & -1 \\ 1& 0 \end{bmatrix}$, then which one of the following statement is not correct ?
( A ) $A^4 - I = A^2 + I$
( B ) $A^3 + I = A(A^2 -I)$
( C ) $A^3 - I = A(A -I)$
( D ) $A^3 + I = A(A^3 -I)$