Answer:
True
Step-by-step explanation:
An observation research study focuses on seeing what Bianca's customers do, but without interacting with them.
The researchers should try to find out where do Bianca's customers go after visiting her store, hopefully without being noticed and they should take notes about their behavior. It is very important that the subjects do not know that they are being observed, for two practical reasons: the first one so that their behavior is natural and not biased, and to avoid any potential problems with the subjects (not everyone likes to be observed specially by strangers).
A practical way to carry out this research would be to use the mall's cameras, but that depends entirely on the security policies of the mall. This type of research doesn't require any type of survey or further data collection.