What Does This SQL Command Accomplish? ALTER TABLE PRODUCTS

Multiple Choice

What does this SQL command accomplish? ALTER TABLE PRODUCTS
ADD CHECK (SIZE IN ('S', 'M', 'L', 'XL', 'XXL') ) ;

A) updates all values in the SIZE column
B) adds a parent-child constraint to the PRODUCTS table
C) establishes a foreign key for the PRODUCTS table
D) establishes legal values for the SIZE column