In terms of register, which one is the odd one out

A mass reduction is composed of an inner, an outer wall, and an array of high-frequency microwave emitted.

Privately owned camping sites must have and display a licence from the local council

To get a new energy certificate for your home, business, or public building, you need to have it assessed.

You need a licence to keep some animals considered to be wild, dangerous, or exotic, such as bears, venomous snakes, jellyfish, and kangaroos.