Which statement correctly describes an object's speed and velocity?
- AThe speed and velocity of an object are always greater than zero.
- BThe speed of an object is always greater than its velocity.
- CThe velocity of an object is equal to its speed in a given direction.
- DSpeed can be measured in $\text{m s}^{-1}$ but velocity can only be measured in $\text{km h}^{-1}$.