a) Cleanup model
b) Mark and sweep model
c) Space management model
d) Sweep model
Answer: b
Explanation: A mark and sweep garbage collection consists of two phases, the mark phase and the sweep phase. In mark phase all the objects reachable by java threads, native handles and other root sources are marked alive and others are garbage. In sweep phase, the heap is traversed to find gaps between live objects and the gaps are marked free list used for allocating memory to new objects.
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