यदि $\sqrt{-5-12 i}+\sqrt{7+24 i}$ का मान एक ऋणात्मक वास्तविक संख्या $k$ है,तो $k=$

  • A
    $-5$
  • B
    $-7$
  • C
    $-6$
  • D
    $-4$

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