Overlapping activities on a project, such as design and construction, are referred to as?

I go with C - Fast tracking and it is possible to execute while design in progress.

Of course it is C - Fast tracking

I go with option C Fast Tracking ... 

I found the link where this question came from and it gives you the answer as well ...

Overlapping activities on a project, such as design and construction, is ...

I think option C  - Fast Tracking

B. Synchronous manufacturing.......................

how can we design and construct at the same unless it is on job design or at field construction , i think this is only process improvement option a