Select the option that expresses the given sentence in active voice.

प्र:

A new gallery is being built inside the city stadium.

• 1
  They will build a new gallery inside the city stadium.
• 2
  They were building a new gallery inside the city stadium.
• 3
  They have been building a new gallery inside the city stadium.
• 4
  They are building a new gallery inside the city stadium.