Environment & Ecology · Bioremediation

With reference to Bioremediation, consider the following statements: Statement-I: Bioremediation is often regarded as more economical and less environmentally disruptive than methods such as excavation and landfilling. Statement-II: It employs living organisms, especially microorganisms, to degrade or convert pollutants into less harmful products such as water, carbon dioxide and biomass. Statement-III: It may also be useful in dealing with heavy metal contamination, since certain microbes can transform or immobilise metals such as lead and mercury. Which one of the following is correct in respect of the above statements?