Fault management in a VNF is more challenging than that of a PNF because

Virtual machines does not produce enough logs
There is no hard disk in a virtual machine where the fault information can be stored when a fault occurs
Virtualized network environment is very dynamic in nature and comprises of multiple layers. Isolating a fault and identifying the root cause in such an environment is difficult
Virtual machine becomes slow when we try to debug them
Verified Answer
Correct Option - c

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