Reasons for OOMKilled in kubernetes

I try to get a general understanding of OOMKilled events and I've found 2 different reasons:

1. Pod memory limit exceeded: If the Container continues to consume memory beyond its limit, the Container is terminated.

2. Node out of memory: If the kubelet is unable to reclaim memory prior to a node experiencing system OOM, ... then kills the container ...

Questions

• Is this correct?
• Are there any other reasons?
• Is it possible to see which reason caused the OOMKilled? (It's important to know the reason, because the remedy will be different.)

Both problems result in different error states:

1: An exceeded pod memory limit causes a OOMKilled termination

2: Node out of memory causes a MemoryPressure and pod eviction.

kubectl describe pod mypod-xxxx

...
Reason:         Evicted
Message:        Pod The node had condition: [MemoryPressure].
...