Question: Why is the following query NOT valid as a NATURAL JOIN? SELECT customer.first _ name, customer.last _ name, employee.first _ name, employee.last _ name FROM

Why is the following query NOT valid as a NATURAL JOIN?
SELECT customer.first_name, customer.last_name, employee.first_name, employee.last_name
FROM customer
NATURAL JOIN employee;
The tables do not have a foreign key relationship.
The syntax used for NATURAL JOIN is not correct.
The tables have a shared column, but their column names are not identical, so a JOIN... ON is needed.
These two tables do not share any identical columns/fields.

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