True or False: Space Structures

$0$ points possible $($ungraded$)$

Which of the following statements are correct?

A$.$ Fairings protect the payload of a launch vehicle against the aggressive environment.

B$.$ To provide a load path through a space structure two categories of structures can be distinguished: truss structures and stage structures.

C$.$ The fuel tanks inside a launch vehicle are always part of the primary structure.

D$.$ Polar platforms are characterized by a central load bearing element such as a cone or cylinder.