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Which of the following statement(s) is(are) CORRECT regarding the $lac$ operon in $E. coli$ when grown in the presence of glucose and lactose?

  1. At low glucose level, the operon is activated
  2. At high glucose level, the operon is activated to enable the utilization of lactose
  3. The $lac$ repressor binds to operator region inactivating the operon
  4. Binding of lactose to the $lac$ repressor induces the operon
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