The WBS is

a. a chart showing the flow of work from the start to the end of the project.

b. a chart showing the hierarchical listing of all the tasks and sub-tasks to be performed.

c. a narrative (text) description of all the tasks and sub-tasks to be performed.

d. a chart showing the time line of activities for the life of the project.

e. only a and b.

The correct answer is OPTION (b) a chart showing the hierarchical listing of all the tasks and sub-tasks to be performed.

Explaination : As the Definition, WBS stands for Work Breakdown System, it is breaking down of all the work in a project in a simplest manner in hierarchical listing which shows that what particular task is assigned for whom and further the hierarchical listing is numbered for more optimization.

This is the reason option (c), (d) and (a) is not the correct option as WBS is hierarchical not a narrative text structure.