Which two characteristics of messenger protocols make data exfiltration difficult to detect and prevent? (Choose two)

Which two characteristics of messenger protocols make data exfiltration difficult to detect and prevent? (Choose two)
A . Outgoing traffic is allowed so users can communicate with outside organizations.
B . Malware infects the messenger application on the user endpoint to send company data.
C . Traffic is encrypted, which prevents visibility on firewalls and IPS systems.
D . An exposed API for the messaging platform is used to send large amounts of data.
E . Messenger applications cannot be segmented with standard network controls

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Answer: C,E