A measurement of the length of an object that is moving relative to the laboratory consists of noting the coordinates of the front and back:
A. at different times according to clocks at rest in the laboratory
B. at the same time according to clocks that move with the object
C. at the same time according to clocks at rest in the laboratory
D. at the same time according to clocks at rest with respect to the fixed stars
E. none of the above
