L$0\mathrm{.}01\mathrm{.}1\mathrm{.}1$

For ease of data entry into a university database, $1$ denotes the student is enrolled in an undergraduate degree program, $2$ indicates the student is enrolled in a master's degree program, and $3$ indicates the student is enrolle a doctoral degree program. In this case, the data are which scale of measurement?

nominal

ordinal

interval

ratio