Select the close-packing arrangements in...

Select the close-packing arrangements in the following:
a. … `ABABABA` …, b. … `ABCABCABCA` …
c. … `ABABCBCABC` … , d. … `AC CBCABCABC` …

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The correct Answer is:

(a, b, c)

hcp, ccp, and their combination `(hcp + c cp)` are close-packed arrangements with packing efficiency of `74%`.

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