A company manufactures and sells high$-$end furniture. It compiles a list of all the products it offers and then mails the list to all its customers. Customers can select what they want and then order the product:$\text{'}$ This is an example of:

a$.$ personal selling.

b$.$ a catalogue.

c$.$ DRTV$.$

d$.$ a kiosk.

e$.$ media buy.