Select the correct indirect form of the given sentence.
The teacher said to the students, "How has the life of children living in slums been described?"
1
The teacher asked the students that how had the life of children living in slums been described.
2
The teacher told the students that how the life of children living in slums had been described.
3
The teacher asked the students how the life of children living in slums had been described.
4
The teacher asked the students that how the life of children living in slums has been described.