Multiple Regression Number of Variables and Predictors?


Could someone please help me with this question I've been staring at my textbook for hours and it doesn't explain how to find no of variable or predictors..

A researcher gathered 155 observations on four variables: job satisfaction, occupation, industry, and marital status. She wants to develop a multiple regression model to predict job satisfaction by the other three variables. All three predictor variables are qualitative variables with the following categories.

Occupation: accounting, management, marketing, finance.
Industry: manufacturing, healthcare, transportation.
Marital status: married, single.
How many variables will be in the regression model? Delienate the number of predictors needed in each category and discuss the total number of predictors.

Number of variables =

Number of predictors =