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Select the correct combination of statements (I - IV) regarding the characteristics of productivity.

1. The rate of biomass production is called productivity and is expressed in terms of a kcal.

2. Gross primary productivity is rate of production of biomass during photosynthesis.

3. Gross primary productivity minus respiration loss is called net primary productivity.

4. Primary productivity depends only on the plant species inhabiting a particular area.

Which of the following statement(s) is/are correct?

A) 1, 2 and 3                     

B) 2 and 3

C) 2, 3 and 4                     

D) 2 and 4