Why do we use the keyword $$payable$$ in the following code?

function enter$()$ public payable $\{...\}$

Group of answer choices

This allows the contract to pay an account.

This allows the contract to pay the function.

This allows an account to send along some Ether, which will be collected in the contract.

This allows an account to send along some Ether, which will be collected in the function.