Detailed Explanation:

The correct answer is 1, 2, 3 and 4 (Option 4). Birds, dust, rain, and wind all help spread plant diseases by carrying fungi, bacteria, viruses, or other pathogens from infected plants to healthy ones.

📗 Concept 

Plant disease transmission occurs through different agents called vectors or dispersal agents. Wind and rain spread fungal spores and bacteria, while birds and other animals carry pathogens through their feathers, feet, or droppings.