Explanation:

The constitution of India has provided (in article 102) that a member of parliament will be disqualified for membership if: He holds any office of profit under the Union or state government (except that of a minister or any other office exempted by Parliament) He is of unsound mind and stands so declared by a court. He is an undischarged insolvent. He has ceased to be a citizen of India. He is disqualified under any other law by parliament The last condition above led the parliament to include some other conditions for disqualification in Representation of People Act (1951). These are as follows: He must not have been found guilty of certain election offences and corrupt practices He must not have been convicted for any offence that results in imprisonment for two or more years. However, detention under preventive detention law is not disqualification. He must not have failed to lodge an account of election expenses within stipulated time. He must not have any interest in government contracts, works and services. He must not be a director or managing personnel in a company / organization in which government has at least 25% share. He must not have been dismissed from government service due to corruption or disloyalty to state. He must not have been convicted for promoting enmity between groups. He must not have been punished for supporting social crimes such as untouchability, sati, dowry etc.
statements 3 is incorrect because it is not written any where under grounds of disqualification of member of parliament thatthe person has/had been detained under the Preventive Detention Law.