Answer:
1- experiential
Step-by-step explanation:
An experiential research is a type of research study that involves a direct and real life observation of the people being understudied, whereby the people that are being observed or understudied contributes directly to the activity that is being observed or researched as well as providing real insights in a natural settings for researchers to get or draw conclusions from.
An experiential research directly involves the participants that are being studied.
As stated in the question above, we can say the observational approach that was used by Best Western is the experiential research, as participants that are being studied were asked to record themselves with a cell phone camera while they spent seven days on vacation.