Given the customer table and the data that it contains, and assuming that you have the rights to modify the table, which of the following ALTER TABLE statements would create an error? a$.)$ ALTER TABLE customer ALTER COLUMN state TYPE VARCHAR $(100)$; b$.)$ ALTER TABLE customer ALTER COLUMN postal$\_$code TYPE VARCHAR $(100)$; c$.)$ ALTER TABLE customer ALTER COLUMN postal$\_$code TYPE text; d$.)$ ALTER TABLE customer ALTER COLUMN city TYPE INT;