Consider the following statements and select the correct answer using the code given below: 1. The non-living components set the stage for the operation of the ecosystem. 2. The duration of Sun exposure is the photo-period. 3. Along the equator, days are almost 12 hours in length throughout the year.

• 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