Question no : 127 PS Organization Project Builder

In SAP PS, You can maintain/create which of the following objects in the Project Builder ?

I)      Work Breakdown Structure.
II)     Work Center.
III)    Network.
IV)   Milestone.
V)    Project definition.

A)    I, III
B)    I, III, V
C)    III, V
D)    I, III, IV
E)    I, III, IV, V
.