What distinguishes speed from velocity?

Speed encompasses the direction of an object, whereas velocity does not consider it.
Speed is consistently greater than zero, whereas velocity can be either greater or less than zero.
Velocity incorporates the direction of an object, while speed does not account for it.
Velocity is consistently greater than zero, while speed can be either greater or less than zero.

The correct answer is:

Velocity incorporates the direction of an object, while speed does not account for it.