In the context of system memory management, which statement correctly describes the state thresholds for a node$$s memory?

The thresholds are fixed and do not depend on the size of the physical memory.

The thresholds are determined by the amount of free memory, with NORMAL state being when the free memory is greater than $48$ MB$,$ regardless of the size of the physical memory.

The thresholds are set by the user and can be changed at any time.

The thresholds are determined by the size of the physical memory; for example, on a node with $2$ GB of physical memory, the memory state is considered NORMAL as long as the free memory is greater than $48$ MB$.$