What is a functional difference between a Cisco ASA and Cisco IOS router with Zone-Based Policy Firewall?

What is a functional difference between a Cisco ASA and Cisco IOS router with Zone-Based Policy Firewall?
A. The Cisco ASA can be configured for high availability, whereas the Cisco IOS router with Zone-Based Policy Firewall cannot.
B. The Cisco IOS router with Zone-Based Policy Firewall can be configured for high availability, whereas the Cisco ASA cannot.
C. The Cisco ASA denies all traffic by default, whereas the Cisco IOS router with Zone-Based Policy Firewall starts out by allowing all traffic, even on untrusted interfaces.
D. The Cisco IOS router with Zone-Based Policy Firewall denies all traffic by default, whereas Cisco ASA starts out by allowing traffic until rules are added.

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