What would be the scenario of negative acceleration

Negative acceleration refers to any object that has a force acting on it in a direction that is opposite to what it is initially travelling in. In this scenario the object may: ... travel at a slower speed, in the opposite direction, OR. travel at a slower speed and in the same direction (known as deceleration), OR.

In this scenario the object may travel at a slower speed, in the opposite direction, or travel at a slower speed and in the same direction