Which flag for a service would allow a container to consume more than 2 GB of memory only when there is no memory contention but would also prevent a container from consuming more than 4GB of memory, in any case?

Which flag for a service would allow a container to consume more than 2 GB of memory only when there is no memory contention but would also prevent a container from consuming more than 4GB of memory, in any case?
A . –limit-memory 2GB –reserve-memory 4GB
B . –limit-memory 4GB –reserve-memory 2GB
C . –memory-swap 2GB –limit-memory 4GB
D . –memory-swap 4GB –limit-memory 2GB

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Answer: C