Explanation:

- Alley Cropping (Option 1): This system involves planting perennial hedges, such as trees or shrubs, in rows with agricultural crops grown in the alleys between them. It capitalizes on the benefits of biodiversity and improved microclimates.

- The Taungya System: In this method, crops and tree seedlings are grown simultaneously. It's often used in forestry to help young trees establish, with crops providing initial income.

- Riparian Buffer: This involves plantings along water bodies to prevent erosion and filter runoff, rather than integrating with crops.

- Relay Cropping: Involves sequential planting, where a second crop is sown after the first is established.