When separating items in a list, a writer should Abd
end the list with a colon.
separate the items with colons.
add a comma after the "and" before the last item.
add a comma before the "and" before the last item,

Usually, we use a comma to separate three items or more in a list. However, if one or more of these items contain commas, then you should use a semicolon, instead of a comma, to separate the items and avoid potential confusion.

we need to see the statements.