Which of the following is the core of an operating system that maintains the computer’s clock, starts applications, and assigns the computer’s resources, such as devices, programs, apps, data, and information?

You wanted to look up information about alzheimer's, but you were unsure if it was spelled "alsheimer's" or "alzheimer's." which advanced search strategy would be useful? a) a boolean search b) using a wild card in your search c) trying different search engines d) doing a search for "alsheimer's not alzheimer's" asap. ill give brainlist.