Which of the following defines a vertical Network Slice?

Which of the following defines a vertical Network Slice?
A . When it serves a given customer for a specific purpose, such as anational energy network.
B . When it cross all the network layers from the radio up to the core.
C . When it serves a given common purpose, for a use case with a defined QoS (eg a use case in transportation, in energy).
D . When it operates on the same layer of the ISO/OSI model.

Answer: A

Explanation:

Reference: https://www.gsma.com/futurenetworks/wp-content/uploads/2018/06/Network-Slicing-Use-Case-Requirements-_-FInal-.pdf