Which of the several aspects of the Command pattern may be varied or elaborated to help achieve particular design goals
A. An invoker may accept registration of more than one command
B. The invoker may offer operations for un-registering one or more commands
C. An invoker may offer several kinds of registrations for different kinds of events
D. All of the mentioned
Answer:A
Which of the several aspects of the Command pattern may be varied or elaborated to help achieve particular design goals
A. An invoker may accept registration of more than one command B. The invoker may offer operations for un-registering one or more commands C. An invoker may offer several kinds of registrations for different kinds of events D. All of the mentioned
Explanation: All of the mentioned are the goals.