Option 1: According to the statement, a person who is not a member of either House of the Parliament can be appointed a member of the Council of Ministers. This statement is correct, as there is no requirement that a person needs to be a member of the Parliament to become a minister.
Option 2: The statement suggests that anyone can be appointed as a member of the Council of Ministers for a maximum period of three years. This statement is incorrect. There is no specific time limit for the appointment of a minister. The tenure of the minister depends on the discretion of the appointing authority.
Option 3: According to this statement, a person shall not be less than 25 years of age in order to become a minister. This statement is correct. The Constitution of India requires that a person must be at least 25 years old to become a minister.
Therefore, the correct answer is option 3 - 1 and 3 only.