A local artists$$ guild wants to build a database to track the local artists who apply for membership. The guild wants to track each artist$$s name, address, and email address. For sculptors, it needs to track the address of their studio and their assistant$$s name. For glass blowers, it needs to track the studio address. For painters, the guild needs information about the location of their studio and the type of painting they specialize in $($such as abstract$,$ portraits, or watercolor$).$

An EER has been designed for the above scenario. How many subtypes are there?