In a triangle $ABC$,if $3 \sin A + 4 \cos B = 6$ and $4 \sin B + 3 \cos A = 1$,then $\sin (A + B)$ is equal to

  • A
    $1$
  • B
    $\frac{1}{2}$
  • C
    $0$
  • D
    $\cos C$

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