When a new LUN is allocated, which volume and LUN configuration will use the smallest amount of storage?

When a new LUN is allocated, which volume and LUN configuration will use the smallest amount of storage?
A . Volume guarantee none, fractional reserve 0, space reservation disabled
B . Volume guarantee none, fractional reserve 0, space reservation enabled
C . Volume guarantee volume, fractional reserve 100, space reservation enabled
D . Volume guarantee volume, fractional reserve 100, space reservation enabled

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Answer: A