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What is the primary difference between the header section of a document and the body? a. the body is displayed on the webpage and the header is not. b. the header is displayed on the webpage and the body is not. c. the tag for the body is self-closing, but the tags for the headers must be closed. d. the tag for the header is self closing, but the tag for the body must be closed.

Which boolean operator enables you to exclude a search term? a} not b} and c} or d} plus

Can someone work out the answer as it comes up in one of my computer science exams and i don't understand the cryptovariables