How many of the following statements correctly differentiate Natural Farming from Organic Farming?

1. Organic farming follows standardized certification processes, while natural farming does not require certification.

2. Natural farming eliminates all external inputs, including organic fertilizers, whereas organic farming permits bio-fertilizers and organic pesticides.

3. Organic farming promotes soil health through compost and manure, while natural farming relies on minimal human intervention for soil fertility.

4. Natural farming is cost-effective due to "zero-budget farming," whereas organic farming involves higher costs due to certification and input management.