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sequence diagram, a doubt

Tausif Khanooni
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CFW's question is:

33. Which of the following statement are false about sequence diagrams?

a. Sequence Diagrams can also capture concurrent activities.
b. Activations should not be used for concurrent activities
c. Asynchronous message is represented by "half-arrow";
d. Asynchronous message blocks the caller until it is completed.
e. Asynchronous message must create a new thread, create a new object and communicate with a thread that is already running
f. Object deletion, indicated by a large X, must be self-delegation (cleaning up your own mess)

This question has 2 correct answers.

According to CFW, the answer is B & D.
What i feel is, the E & F should also be correct answers because
E : the word MUST is used for creating the new thread, what i feel is.. it may create or may not create. word MUST make the compultion, HANCE IT MUST BE TREATED AS FALSE

B. here also the same case, the object might be deleted by self or it might be deleted by other object who contains it.


thnks in advance
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