RaxstockCom,an Online Retailer,desires to Find Shopping Trends of Its Customers

Raxstock.com,an online retailer,desires to find shopping trends of its customers to make advertising campaigns more effective.Therefore,it uses a special type of program that works through the Internet and gathers this information secretly from customer's browsing history.In the context of security and ethical issues affecting information systems,Raxstock.com is using a

A) worm.
B) botnet.
C) spyware.
D) bug.