The IPv6 address, 2001:0000:0000:3210:0800:200C:00CF:1234, can be shortened to __________.
A. 2001:X:X:3210:800:200C:CF:1234
B. 2001:0-0:3210:800:200C:CF:1234
C. 2001.0.0.3210.800.200C.CF.1234
D. 2001:0:0:3210:800:200C:CF:1234
Answer: D
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