Explanation:

- The National Slum Development Programme (NSDP) was launched to improve the living conditions of slum dwellers in urban areas.

- Option 1: 1977 - This is not the year when the NSDP was introduced. This year is unrelated to its launch.

- Option 2: 1996 - This is the correct year when the National Slum Development Programme was launched in India to address the needs of slum populations.

- Option 3: 1995 - This year is incorrect for the introduction of the NSDP. Other programs may have been relevant in 1995, but not this particular one.

- Option 4: 1997 - This year is incorrect concerning the NSDP's launch; the program started a year earlier.

- Correct Answer: Option 2 - 1996