What three changes have occurred in modern networks that require enhanced security? (Choose three.)

What three changes have occurred in modern networks that require enhanced security? (Choose three.)
A . Modern networks utilize a common set of widely known and open protocols.
B . The use of common operating systems on smart phones such as Apple iOS and Android has provided attackers with simpler means to instigate targeted attacks.
C . Fault tolerance and backup systems provide threat actors easy access to system resources and data.
D . The global connectivity of the Internet provides more opportunities for threat actors to connect to information systems.
E . The increased complexity of operating systems and application software has made it more difficult to ensure security across all systems.

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Answer: ADE