A Cisco ASA requires an additional feature license to enable which feature?

A.
transparent firewall

B.
cut-thru proxy

C.
threat detection

D.
botnet traffic filtering

E.
TCP normalizer

Explanation:
http://www.cisco.com/en/US/docs/security/asa/asa83/license_standalone/license_management/lic
ense.html#wp1450282