Firms Use Various Methods for Identifying Customers Such as ________

Firms use various methods for identifying customers such as ________ and ________.

A) observable characteristics such as willingness to wait in long lines ; their actions such as early adoption
B) observable characteristics such as age; their actions such as willingness to wait in long lines
C) the color of their hair; whether or not they roll their eyes at high prices
D) None of the above.