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Adu is the head of IT security for a large multinational company. One of his team members has brought to his attention that several employees are sending sensitive company data via email in cleartext. This means that the data is not encrypted and can be easily intercepted by cybercriminals. He has decided to take immediate action to address this issue and prevent any data breaches. What is the best course of action to take in order to secure the sensitive company data being sent via email?