જો $f^{\prime}(x)=k(\cos x-\sin x)$,$f^{\prime}(0)=3$,અને $f\left(\frac{\pi}{2}\right)=15$ હોય,તો $f(x)=$

  • A
    $3(\sin x+\cos x)+12$
  • B
    $3(\sin x+\cos x)-12$
  • C
    $-3(\sin x+\cos x)-12$
  • D
    $12(\sin x+\cos x)+3$

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