For the most part, you’ll know which category of certification to apply for based on your educational experience. For instance, someone that has participated in the Ministry Formation Program of the Diocese but does not have other training in ministry would probably fit in Category I. Someone with a BA would fit in Category II, and someone with a MA would fit in Category III.
The situation may arise though, where someone has educational experience more equivalent to a category he or she does not have a degree for. For instance, some people that have been involved in ministry for a number of years taking advantage of many educational opportunities may better fit in Category II than Category I. In these cases, the applicant may well choose to pursue certification in Category II.