For $3\times 3$matrices $MandN,$which of the following statement (s) is (are) NOT correct ?$N^{T}MN$is symmetricor skew-symmetric, according as $m$is symmetric or skew-symmetric.$MN-NM$is skew-symmetric for all symmetric matrices $MandN\dot{}$$MN$is symmetric for all symmetric matrices $MandN$$\left(adjM\right)\left(adjN\right)=adj\left(MN\right)$for all invertible matrices $MandN\dot{}$

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