Albert Einstein's theory of special relativity revolutionized our understanding of space, time, and the relationship between matter and energy. According to special relativity, which of the following statements about the speed of light (c) in a vacuum is true?
a) The speed of light is constant in all frames of reference.
b) The speed of light increases with the velocity of the observer.
c) The speed of light decreases with the velocity of the source.
d) The speed of light varies depending on the medium it travels through.
e) The speed of light can exceed its known constant value under extreme
