Identify the correctly constructed ALTER TABLE statement that creates a new column called address with a data type of VARCHAR$(100)$ in the customer table.

a$.)$

ALTER TABLE customer

ADD address;"

b$.)$

ALTER TABLE customer

ADD 'address' VARCHAR $(100)$;

c$.)$

ALTER TABLE customer

DROP address VARCHAR $(100)$;

d$.)$

ALTER TABLE customer

ADD address VARCHAR $(100)$;