What is a key difference between a zImage and bzImage kernel image?

What is a key difference between a zImage and bzImage kernel image?
A . zImage is compressed using gzip, bzImage is compressed using bzip2.
B . zImage is for 2.6 series kernels, bzImage is for 3.x series kernels.
C . zImage is limited to 64k, bzImage has no such restriction.
D . zImage gets loaded completely into low memory. bzImage will load into high memory once low memory is full.

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Answer: D