What is the difference between a resource limit and a resource reservation when scheduling services?

What is the difference between a resource limit and a resource reservation when scheduling services?
A . A resource limit and a resource reservation can be used interchangeably.
B . A resource limit is a soft limit for your service, while a reservation is hard limit and the docker engine will do its best to keep your service at the limit.
C . A resource limit is used to find a host with adequate resources for scheduling a hard limit for your service, while a reservation is hard limit for your service.
D . A resource limit is hard limit for your service, while a reservation is used to find a host with adequate
resources for scheduling. Correct

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Answer: A