In the following list of letters,how many $O$'s are followed by $Q$'s but not preceded by $D$'s?
$D, O, Q, O, D, Q, O, D, O, D, Q, D, O, Q, D, S, D, Q, P$
$O, Q, D, S, S, S, D, O, Q, O, Q, D, O, Q, D, D, O, Q$

  • A
    $0$
  • B
    $1$
  • C
    $2$
  • D
    $3$

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