Tyrone developed an idea for a program to help perform real estate appraisals more quickly and accurately. He has a buddy who

is a programmer that helped him develop a detailed description of what the program will do and how it differs from existing apps.

Now, Tyrone has taken this description and shown it to fellow real estate agents to see if his idea appeals to them. What is

Tyrone engaging in$?$

Multiple Choice

prototype outsourcing

B$2$B advertising

concept testing

word$-$of$-$mouth promotion