Determine if the vectors emanating from the origin and terminating at the following pairs of points are parallel.

**(a)** (3, 1, 2) and (6, 4, 2)

**(b)** (-3, 1, 7) and (9, -3, -21)

**(c)** (5, -6, 7) and (-5, 6, –7)

**(d)** (2,0, – 5) and (5, 0, -2)

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