Select the option that expresses the given sentence in active voice.
Walking zones have been demarcated using paints and cones by the municipal corporation.

A

Walking zones are demarcating the municipal corporation using paints and cones.

B

The municipal corporation has demarcated walking zones using paints and cones.

C

The municipal corporation will demarcate walking zones using paints and cones.

D

The municipal corporation is demarcating walking zones using paints and cones.