What is the fundamental difference between line and functional authority?

Question

A. Functional authority can be delegated, line authority can't be.
B. Line authority is associated with the individual, functional authority is associated with the position.
C. Line authority can be delegated, functional authority can't be.
D. Line authority rests on special skills, functional authority depends on acceptance.

Answer 1

https://managementinnovations.wordpress.com/2008/12/18/types-of-authority-line-staff-roles/