Definition: In this task, you are given a news article. Your task is to classify the article to one out of the four topics 'World', 'Sports', 'Business', 'Sci/Tech' if the article's main topic is relevant to the world, sports, business, and science/technology, correspondingly. If you are not sure about the topic, choose the closest option. Note that URLs in the text have been replaced with [Link].
Input: Cisco tightens security on voice products On Monday, the company announced that it has added new privacy features to its CallManager product, which maps phone numbers to IP addresses and keeps track of phone calls that are made.

Sci/Tech