Which of these is a key difference between one-dimensional (1D) and two-dimensional (2D) vectors?
(a) 1D vectors have a direction indicated by either a (+) or (-) sign, but 2D vectors have a more complex direction.
(b) 1D vectors only have a magnitude while 2D vectors have both magnitude and direction.
(c) 1D vectors are always positive, but 2D vectors can be positive or negative.
(d) 1D vectors only have one possible direction, but 2D vectors have two possible directions.
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