Question: Two spacecrafts A and B are moving relative to each other at a constant velocity. Observers in spacecraft A see spacecraft B. Likewise, observers in

Two spacecrafts A and B are moving relative to each other at a constant velocity. Observers in spacecraft A see spacecraft B. Likewise, observers in spacecraft B see spacecraft A. Who sees the proper length of either spacecraft?
(a) Observers in spacecraft A see the proper length of spacecraft B.
(b) Observers in spacecraft B see the proper length of spacecraft A.
(c) Observers in both spacecrafts see the proper length of the other spacecraft.
(d) Observers in neither spacecraft see the proper length of the other spacecraft.

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