Choose the correct answer.

Given the following bdd fragment:

A user provides login credentials to the User Interface, and the Controller passes this information to the User Database The User Database in turn validates the user name and password (typed by PW In the «flow Specification») and responds with a Boolean value indicating whether the login was successful. The Controller provides the password to the Key Generator if login was successful.

Which diagram correctly models these communications? If two or more options are correct, select the one that passes no unnecessary information between any two blocks If two or more correct options pass the same information between blocks, select the one with the fewest ports.

A)

B)

C)

D)