Explanation:

• 1, 2, 3, 4 and 5
• By birth (1): A person can become a citizen of India by birth if they are born in India or if one or both of their parents are Indian citizens.
• By registration (2): Certain categories of persons, such as persons of Indian origin residing outside India, can acquire Indian citizenship by registration as specified in the Citizenship Act.
• By descent (3): Individuals born outside India to Indian citizens are eligible for Indian citizenship by descent, subject to certain conditions.
• By incorporation of territory (4): When new territories are incorporated into India, the residents of those territories automatically become Indian citizens.
• By naturalization (5): Foreigners who have resided in India for a specified period and fulfill other conditions prescribed by the Citizenship Act can acquire Indian citizenship by naturalization.
• Therefore, option 4 (1, 2, 3, 4, and 5) is the correct choice