Consider the following assertion:

Integrated land-use planning offers a stronger basis for soil conservation than isolated local measures alone.

Which of the following statements support the assertion?

1. Conservation requirements vary with climate, land configuration and the social behaviour of local communities.
2. Land should be classified according to its capability and supported by appropriate land-use maps.
3. Conservation ultimately depends on the participation of people who use the land and receive its benefits.
4. Every available piece of land should be brought under cultivation regardless of its slope or capability.

Select the correct answer using the code given below.