In the context of solving pollution problems, what is/are the advantage/advantages of bioremediation technique ? 1. It is a technique for cleaning up pollution by enhancing the same biodegradation process that occurs in nature. 2. Any contaminant with heavy metals such as cadmium and lead can be readily and completely treated by bioremediation using microorganisms. 3. Genetic engineering can be used to create microorganisms specifically designed for bioremediation. Select the correct answer using the code given below :

Option (c) is correct because bioremediation utilizes natural microbial metabolism to degrade organic pollutants (Statement 1) and can be enhanced through genetic engineering to target specific contaminants (Statement 3). Statement 2 is incorrect because heavy metals like cadmium and lead are elements that cannot be "biodegraded" or completely destroyed; microbes can only transform their oxidation state or sequester them, making the claim of "ready and complete" treatment scientifically inaccurate. The core concept tested is the functional mechanism and inherent limitations of using biological agents for environmental detoxification.