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26. Which of the following is true about denial-of-service attacks? (1) A denial-of-service attack takes advantage of a network communications protocol to tie up the server's communication ports so that legitimate users cannot gain access to the server (2) If the denial-of-service attack is successful, the attacker can gain access to unprotected resources on the server a. 1 only b. 2 only c. Both 1 and 2 d. Neither 1 nor 2