Which of the following is not a ground of divorce under Section 2 of the Dissolution of Muslim Marriage Act, 1939?
1
husband has been sentenced to imprisonment for a period of seven years or more
2
failure of the husband to pay maintenance for the last 2 years
3
whereabouts of the husband have not been known for a period three years
4
failure of the husband to perform, without reasonable cost, his marital obligations for a period of three years