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Rescuers are drilling through fallen rock in order to rescue some men trapped in a cave. The drill needs lubricating from time to time. The following statements were made about the materials used for the drill tip and the lubricant and the reasons for their use. 1)Diamond was used for the drill tip as it does not conduct electricity. 2)Diamond was used for the drill tip as it is very hard. 3)Graphite was used as the lubricant as it conducts electricity. 4)Graphite was used as the lubricant as it is soft and flaky. which statements are correct?