For the production of characteristic $K_{\beta}$ $X$-rays,the electron transition is:

  • A
    $n = 2$ to $n = 1$
  • B
    $n = 3$ to $n = 2$
  • C
    $n = 3$ to $n = 1$
  • D
    $n = 4$ to $n = 2$

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