Explain three of the plans that Pi has for dealing with Ritchard Parker and what's wrong with each?

Pi considers possible plans to rid the boat of Richard Parker. He realizes that his best chance of survival is simply to wait for Richard Parker to die of starvation or dehydration, as Pi’s own supplies are likely to last much longer. 

In the morning the rain eventually clears and Pi gets some sleep. But upon waking he realizes how vast the sea is, how small his raft is, and it occurs to him that Richard Parker can both survive on saline water, and will likely swim to Pi’s raft and kill him if he gets hungry enough. Stricken, Pi describes the utter power of fear.