One of the most expensive brands of shoes for mountain climbing is the Anasazi brand. Many climbers believe it to be the safest brand made. People who want to buy the safest climbing shoes available will accept no other brand of shoe, even though there are several other manufacturers of climbing shoes. Which type of product are Anasazi brand climbing shoes?

a$)$ heterogeneous shopping

b$)$ specialty goods

C$)$ homogeneous shopping

d$)$ convenience goods