Which three options are hardening techniques for Cisco IOS routers? (Choose three.)

Which three options are hardening techniques for Cisco IOS routers? (Choose three.)
A . limiting access to infrastructure with access control lists
B . enabling service password recovery
C . using SSH whenever possible
D . encrypting the service password
E . using Telnet whenever possible
F . enabling DHCP snooping

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Answer: A,C,D