What are the disadvantages in implementing buddy system algorithm for free lists?

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answerhappygod
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What are the disadvantages in implementing buddy system algorithm for free lists?

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a) internal fragmentation
b) it takes so much space
c) we no more have the hole lists in order of memory address, so it is difficult to detect if 2 holes remain adjacent in memory and shall be merged into one hole
d) both a and c are correct
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