Bernard says that a mass executing uniform circular motion is not accelerating as it's speed is not changing. Which parts of his statement are correct and which are false. For those which are false state why they are and give the correct version.

Correct:For a mass which is executing uniform circular motion, it's speed doesn't change.
False:(1) A mass which is executing uniform circular motion is not accelerating
Correction to (1)
Acceleration is defined as the change in velocity of an object not speed (with respect to time).Since velocity is a vector it can change if it's magnitude - speed - changes or the direction in which it points changes with respect to time.During uniform circular motion while the speed does indeed remain constant the velocity vectors direction is constantly changing (with respect to time) as the mass is following a constantly curved path.