Which of These Is a Correct and Complete Statement of Einstein's

Multiple Choice

Which of these is a correct and complete statement of Einstein's first postulate of special relativity?

A) One's description of physical reality is the same regardless of the constant velocity at which one moves.
B) One's description of physical reality is the same regardless of the direction in which one moves, even if the speed changes.
C) One's description of physical reality is the same regardless of how one moves.
D) One's description of physical reality is the same regardless of the constant speed at which one moves, even if direction changes.