With Cisco FTD software, which interface mode must be configured to passively receive traffic that passes through the appliance? 

Answer options:

A. inline set
B. passive
C. routed
D. inline tap

B

Reference: https://www.cisco.com/c/en/us/td/docs/security/firepower/640/configuration/guide/fpmc-config-guide-v64/ interface_overview_for_firepower_threat_defense.html