If A is a symmetric matrix and B is a skew-symmetric matrix such that A + B = $$\left[ {\matrix{
2 & 3 \cr
5 & { - 1} \cr
} } \right]$$, then AB is equal
to :
$$\left[ {\matrix{
4 & { - 2} \cr
1 & { - 4} \cr
} } \right]$$
$$\left[ {\matrix{
{ - 4} & { - 2} \cr
{ - 1} & 4 \cr
} } \right]$$
$$\left[ {\matrix{
{ - 4} & 2 \cr
1 & 4 \cr
} } \right]$$
$$\left[ {\matrix{
4 & { - 2} \cr
{ - 1} & { - 4} \cr
} } \right]$$
