A sequence of 15 genes of an unclassified organism was recently discovered. The wildtype sequence is as follows: 123456*789ABCDEF, where the asterisk represents the centromere. Also, there were four mutant strains that were found. What type of chromosomal rearrangement would be concluded if:
a. 1256*789ABCDEF
b. 123456*789FEDCBA
c. 1233456*789ABCDEF
d. 123CBA*987654DEF