Which of these things are true about parameters?

Within their functions, they can be used like variablesThey're optional in a functionThey can be of any typeThey're the return values of a function

Fantastic! Parameters are optional and can be of any type. Within their functions, they can be used like variables, but they're not return values.

Not quite! Parameters are optional and can be of any type. Within their functions, they can be used like variables but they're not return values.