An elevator is moving downward at 3.0m/s when it begins to slow to a stop. Downward is defined as the positive direction. During the slowing interval, the magnitude of its acceleration is 1.2m/s2. What is the signed value of the elevator’s acceleration during this interval?
a) +3.0m/s2
b) +1.2m/s2
c) −1.2m/s2
d) +1.8m/s2