Regard being had to laws relating to Hindu, which of the following is not correct?

Irretrievable breakdown of the marriage is not a ground by itself to dissolve it.

When evidence disclosed that parties, belonging to Santhal Tribe, were following customs of Hindus and not of Santhals, provision of Hindu Succession Act, 1956, would apply to inheritance of property.

Allegations against wife of unchastity, indecent familiarity with another person and extra-marital relationship made in written statement filed by the husband would not constitute cruelty.

None of the above