(1) 0.. (6) 1..1 Which of the following is true to implement the Stock Exchanges and Brokers classes in the preceding UML class diagram in a database? The primary key of Brokers is a foreign key in Stock Exchanges. The primary key of Stock Exchanges is a foreign key in Brokers. The association between Brokers and Stock Exchanges is implemented as a linking table. Both "The primary key of Brokers is a foreign key in Stock Exchanges" and "The primary key of Stock Exchanges is a foreign key in Brokers" are true. None of these are true