If the coordinates of points A, B, C, and D a | vedclass

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(D) The direction ratios of the line segment $AB$ are given by $(x_2 - x_1, y_2 - y_1, z_2 - z_1) = (4-1, 5-2, 7-3) = (3, 3, 4)$.Let these be $a_1 = 3

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None of these

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(D) The direction ratios of the line segment $AB$ are given by $(x_2 - x_1, y_2 - y_1, z_2 - z_1) = (4-1, 5-2, 7-3) = (3, 3, 4)$.Let these be $a_1 = 3, b_1 = 3, c_1 = 4$.The direction ratios of the line segment $CD$ are given by $(x_4 - x_3, y_4 - y_3, z_4 - z_3) = (2 - (-4), 9 - 3, 2 - (-6)) = (6, 6, 8)$.Let these be $a_2 = 6, b_2 = 6, c_2 = 8$.Notice that $(a_2, b_2, c_2) = 2 	imes (a_1, b_1, c_1)$.Since the direction ratios are proportional,the lines $AB$ and $CD$ are parallel.Therefore,the angle between them is $0$.

If the coordinates of points $A, B, C,$ and $D$ are $(1, 2, 3), (4, 5, 7), (-4, 3, -6),$ and $(2, 9, 2)$ respectively,then the angle between $AB$ and $CD$ is:

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