Answer: d. pathping
Step-by-step explanation:
Here we are given a situation where the server user is unable to access the company server.
So in such a situation the command to be used is pathping which is a combination of the two very best protocols ping and tracert. Using pathping we can find all the routers that lie in the path of the server and we can simultaneously ping all the routers to check for their activeness. So in this case we would be able to diagnose the routers that lie in the path of the server.
option a is incorrect as it does not require use of garp command.
option b is incorrect as it test the speed of the net only if the server is reachable.
option c is incorrect as it sends ICMP packets to nearby routers and waits for reply and it works if the server is reachable.