A crime research report revealed that 60% of serious criminal crimes in a city in the past three years were recorded by 350 recidivists. The report also revealed that more than half of the perpetrators of serious criminal cases were drug users. If the above assertions are all true, then which of the following assertions must be true? ['There may be no drug users among the 350 recidivists.', 'There must be drug users among 350 recidivists.', 'Most of the 350 recidivists are drug users.', 'Drug users mostly among 350 recidivists.']