Match the Following Steps in Microsoft's Development of Windows 7

Multiple Choice

Match the following steps in Microsoft's development of Windows 7 to their respective WBS level. Step Level
Develop Windows 7 OS ?
System Testing ?
Compatible with Windows XP ?
Develop GUI's ?
Module Testing ?

A) Level 1, Level 2, Level 4, Level 3, Level 3
B) Level 1, Level 2, Level 3, Level 4, Level 5
C) Level 0, Level 1, Level 2, Level 3, Level 4
D) Level 0, Level 2, Level 2, Level 3, Level 3
E) None of the above patterns is correct.