What is the definition of uniform circular motion?

I- A movement is circular when the object moves on a circumference.
II- A circular movement is uniform when the object covers equal distances in equal times.
III- A circular movement is uniform when the object describes equal angles in equal times.
IV- The period of uniform circular motion is the time it takes for the object to complete one revolution.
a) Only I and II are correct.
b) Only II and III are correct.
c) Only II and IV are correct.
d) Only III and IV are correct.
e) All statements are correct.