Which of the following pair of vectors have the same direction? Select one: O a = a = -i - 2j + 2k and b = +3i+ 8j + 6k. O a = a = 5i - 4j + 3k and b = 15i - 12j + 9k. O a = 3i and b = −4i. O a = -6i - 2j - 4k and b = −15i + 5j + 10k. None of them.

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