PMI ACP intrebarea 6: timeboxed release plan

In a time boxed release plan, the release date is defined in advance.  If so, what is NOT defined in this type of release plan?

(A)      Scope
(B)      Schedule
(C)      Cost
(D)      Quality 

Ei zic asa:

Why (A): In time boxing, specific features are not defined, since whatever can be accomplished in that time period will be done.  

Why NOT (B): Schedule is already defined in advance here

Why NOT (C), Why NOT (D): Whether we adopt time-boxed or scope-boxed releases, the cost and quality will not change. So this is not a parameter to consider

Referinta: The Art of Agile Development - James Shore & Shane Warden, page 212

Am gasit urmatorul link: http://www.jamesshore.com/Agile-Book/release_planning.html

Aici se spune clar: "There are two basic types of plans: scopeboxed plans and timeboxed plans". Prin definitie scopul nu este definit pentru timeboxed plan ... altfel s-ar fi numit scopeboxed plan!!!