A. r35, r30, r3, r25, r20, r2, r15, r10, r1
B. r1, r2, r3, r10, r15, r20, r25, r30, r35
C. r1, r10, r15, r2, r20, r25, r3, r30, r35
D. r35, r30, r25, r20, r15, r10, r3, r2, r1
Explanation: If you can have the table receiving rows always in decreasing order of the
row keys, you then have easy access to the first and last rows. This is possible because
HBase tables are always sorted by row key.