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: Yahoo Rolls Out E-Mail Authentication, Added Storage Yahoo on Monday implemented its own sender authentication scheme, dubbed DomainKeys, for its free Web-based mail service. DomainKeys is one of several authentication technologies that hope to put a stop to 

Sci/Tech