What is a valid implicit permit rule for traffic that is traversing the ASA firewall?

What is a valid implicit permit rule for traffic that is traversing the ASA firewall?
A . ARPs in both directions are permitted in transparent mode only.
B . Unicast IPv4 traffic from a higher security interface to a lower security interface is permitted in routed mode only.
C . Unicast IPv6 traffic from a higher security interface to a lower security interface is permitted in transparent mode only.
D . Only BPDUs from a higher security interface to a lower security interface are permitted in transparent mode.
E . Only BPDUs from a higher security interface to a lower security interface are permitted in routed mode.

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Answer: A