$22.$ Special Relativity $($Time Dilation$)$

Question: According to the theory of special relativity, time dilation means:

a$)$ Moving clocks tick faster than stationary ones

b$)$ Time slows down for objects moving at high speeds relative to an observer

c$)$ Time speeds up as objects move closer to the speed of light

d$)$ The time experienced by all observers is the same regardless of their motion