Answer:
2acd
Step-by-step explanation:
Ironically it is the lowest index which is the Greatest common factor. (You cannot get more from a term than what is there.)
Make sure that a particular base is in both terms and use the lowest power for the GCF.
2acd
There is no b factor in the second term, so it cannot be common.
The opposite happens when find the LOWEST common multiple . then it is the HIGHEST power which has to be used, because the LCM has to contain the whole of each term