Which of the following definition below describes a scaffold?

Which of the following definition below describes a scaffold?

A) A series of steps leading from one level or floor to another that is permanently attached to a structure or building.

B)An opening measuring 12 inches or more in walking or working surface.

C)Any ladder that can be readily moved or carried.

D)Any temporarily elevated platform and its supporting structure.

Answer :

D)Any temporarily elevated platform and its supporting structure.