In the context of personalization technology, which of the following is a drawback of collaborative filtering (cf)?
a. it needs a large sample of users and content to work well.
b. it cannot work well for a single product category.
c. it accepts inputs from only one data source at a time.
d. it cannot make automatic predictions about customers’ interests.

Read the quote about government in iran. “we thought that mr. khatami’s victory was a victory for us as well. the election of a more democratic government seemed to be a bright new beginning . . but within less than a year of the election, the journalists, reformists, and intellectuals began to be persecuted by hard-liners in the judiciary and intelligence ministry . .” —camella entekhabifard, “tehran’s eternal youth,” new york times based on this quote, how does camella entekhabifard feel about the iranian government? a. she supports reforms and was disappointed when they did not come about. b. she supports hard-liners who want the supreme leader to have more power. c. she believes reformers should be silenced to keep iran's government strong. d. she supports a more democratic government but opposes freedom of speech.