Identify the correct statement:

  • A
    If a system of $n$ simultaneous linear equations has a unique solution,then the coefficient matrix is singular.
  • B
    If a system of $n$ simultaneous linear equations has a unique solution,then the coefficient matrix is non-singular.
  • C
    If $A^{-1}$ exists,$(adj A)^{-1}$ may or may not exist.
  • D
    If $F(x) = \begin{bmatrix} \cos x & -\sin x & 0 \\ \sin x & \cos x & 0 \\ 0 & 0 & 1 \end{bmatrix}$,then $F(x) \cdot F(y) = F(x - y)$.

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