In the following use case diagram, which statement is wrong? _____在下面的用例图中,哪个语句是错误的? _____【图片】
A.
Customer can interact with use case "A" in the system.
B.
If use case "A" is executed, use case "B" must be executed.
C.
If use case "A" is executed, use case "C" must be executed.
D.
Use case "C" may not be invoked.