What is the two ways that a charged body can be discharged?

The two ways to charge a neutral body with static electricity is to dump a bunch of electrons onto it, thus making it negative, or attracting a bunch of electrons off of it, which will make it positive. There are several mechanisms that will allow us to do this. Just one example is to rub a balloon on your hair (if your hair is relatively dry) and you'll separate charges. This will cause the balloon to stick to your hair via the mechanism of static electricity.