Which of the Following Statement(s)is (Are)a Consequence of Einstein's Postulates

Multiple Choice

Which of the following statement(s) is (are) a consequence of Einstein's postulates?

A) Every observer in every reference frame measures the same value for the speed of light.
B) Moving clocks appear to run slow.
C) Moving objects appear to be contracted along the direction of motion.
D) Clocks synchronized in one reference frame are not synchronized in any frame moving relative to that reference frame.
E) All of these are consequences of Einstein's postulates.