What Is the Main Difference Between a Vertical Hierarchy of Authority

What is the main difference between a vertical hierarchy of authority and a horizontal specialization?

A) Vertical hierarchy shows the different jobs and horizontal specialization shows the tasks for each person.
B) Horizontal specialization shows the chain of command and vertical hierarchy shows the communication network.
C) Vertical hierarchy shows who reports to whom and horizontal specialization shows the different jobs.
D) Vertical hierarchy has different people for each task and the horizontal specialization shows the chain of command.
E) Horizontal specialization shows the communication network and the vertical hierarchy shows the different jobs.