Goal Post Brewing Company Asked Their Bartenders to Talk with Customers

Goal Post Brewing Company asked their bartenders to talk with customers over the course of a weekend on which beers they'd like to see Goal Post offer in the future, and jot down their notes at the end of their shift. Based on feedback from the bartenders, Goal Post introduced a new, more expensive beer in their taproom a week later. Goal Post's approach to collecting market data was somewhat unique in that

A) they were able to utilize the personal interview collection method inexpensively.
B) they were able to utilize the personal interview collection method, which typically isn't done in the craft brewing industry.
C) they used a focus group collection method to collect secondary data.
D) they used a focus group collection method to collect primary data.