Select the exclusion that fits best with this problem.

Answer:
see below
Step-by-step explanation:
There are no variables x or y or z in the given expression, so all but the answer shown below are irrelevant.
The denominator factors as ...
ab³(a² +ab +b²)
so the restrictions are that these factors cannot be zero. The cases listed in the answer choice shown are the cases that are not allowed.