$\lambda$ ના પૂર્ણાંક મૂલ્યોની સંખ્યા શોધો જેના માટે $f(x) = \sqrt{\ln(2\lambda \cos x + 5)}$ એ તમામ $x \in R$ માટે વ્યાખ્યાયિત છે.

  • A
    $5$
  • B
    $4$
  • C
    $6$
  • D
    $11$

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