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) Level 0,Level 1,Level 1,Level 2,Level 3