Which of the following statements are NOT TRUE?

(A) If A and B are symmetric matrices, then AB – BA is a skew symmetric matrix. 

(B) Multiplying a determinant by k means multiply elements of one column by k.

(C) If $A^2-A+I=0$ , then $A^-1$ is equal to A + I.

(D) If A and B are invertible matrices of same order, then $(A+B)^{-1}=B^{-1}+A^{-1}$. 

Choose the correct answer from the options given below: