Select all that are correct $($Python$)$

Select all the below statements about functions in python that are true:

a$.$ Some functions don't need to be given any arguments to run.

b$.$ A function is a block of code that only runs when it is called and always returns a value when it is done.

c$.$ The name of a function has to follow the same rules as the name of a variable.

d$.$ A python function can accept any number of arguments.

e$.$ A python function can return a list or a tuple.