Various ecological zones require distinct methods for afforestation. Which of the following represents these techniques?

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Planting forests in arid regions using irrigationEstablishing vegetation along canal embankmentsRestoring dry areas without the use of irrigationReviving barren slopes in hilly terrainAll of the above

Explanation

Afforestation approaches vary depending on the ecological conditions. These include planting trees in dry areas with irrigation support, developing vegetation along canal banks, restoring dry lands without irrigation, and rehabilitating denuded hill slopes. Therefore, all the listed methods are valid afforestation techniques.