Final answer:
The technique not suited to a passive footprinting process is Banner grabbing.
Step-by-step explanation:
The technique that is not suited to a passive footprinting process is B. Banner grabbing.
Passive footprinting involves gathering information about a target company without directly interacting with its systems or network. This typically includes techniques like WHOIS lookups, BGP looking glass usage, and registrar checks. However, banner grabbing is an active technique that involves connecting to the target's network and capturing information from banners or headers of network services.