Customers at a restaurant were surveyed to see which type of service they had during their visit (table service, assisted service, or self-service) and their age (18 years or younger or over 18 years old). The results of the survey were displayed in a segmented bar chart.

Which of the following describes this data set?

Categorical and univariate
Numerical and univariate
Categorical and bivariate
Numerical and bivariate