Examine each inference in the context of the passage: (a) definitely true - it directly follows from the facts given; (b) probably true - though not definitely true in the light of the facts given; (c) probably false - though not definitely false; (d) definitely false - it contradicts the facts given. Police personnel patrolling in the forest carrying rifles on their shoulder and looking for smugglers may appear to be a fancy idea. But for the forest department, an armed police patrol force is a much-needed last resort to ward off enemies of the mangroves. The mangrove ecosystem plays a vital role in protecting the land against the ingress of sea water during a tidal surge. It's an invaluable eco-wall and so, and armed police have had to be roped in. It's been done, albeit rarely, in other parts of the country too. In Kendrapara, powerful prawn mafias have for decades illegally occupied vast stretches of area after clearing mangrove forests. Aquaculture is lucrative business: it gets very high returns, on minimal investment. This is why there is always a race to clear mangroves and convert it into fish ponds.