Is It Possible to Violate Any of the Rules for Definitions

Is it possible to violate any of the rules for definitions when choosing a genus?

A) No, because all rule violations occur when choosing the differentia.
B) No, because no matter how broad the genus, the definition can be made good by providing enough differentia.
C) No, because the rules only tell us that a genus is required, but say nothing about what the genus must be.
D) Yes, because all rule violations involve choosing the wrong genus.
E) Yes, because, for example, the genus could make the definition circular.