SQL data definition commands make up a(n) ODDL DML DCL O All of the above Which of the following statements are true about primary keys: * The value of the Primary Key must be unique for each instance of the entity. There can be no missing values( ie. Not Null) for Primary Keys. The Primary key is immutable.i.e., once created the value of the Primary Key can be changed. All the above options are correct None of the above statements are correct In an Entity-Relationship diagram, the Entity Name maps to the Table name, the attributes map to the _* Table rows and columns O Table columns Table rows