What is the reason for the error code?

An administrator wants to get information about a specific host and runs this code:

GET /v1/hosts/{sn}

An API code 404 is returned.

What is the reason for the error code?
A . The provided {sn} was not valid
B . There was a server error
C . The administrator was not authenticated
D . The API is designed to return all hosts in a cluster

Answer: A