Consider the following statements and select the correct answer using the code given below: 1. Ecology is the science of interaction between life forms and their environment. 2. Ecology is the science of ecosystems. 3. Ecology is a boundary transition zone between adjoining ecosystems.

• A.  1 and 2 are correct       
• B.  1 and 3 are correct
• C.  2 and 3 are correct       
• D.  1, 2 and 3 are correct