Which statement(s) is(are) true?

Multiple Choice Questions: (Note: If two or more statements are true, and you select only one true statement, there is no partial credit for the partially correct selection). Which statement(s) is(are) true? O a. In the Service Process matrix, the x-axis denotes volume and the y-axis denotes customization. O b. In the Service Process matrix, the x-axis denotes customization and the y-axis denotes volume. O c. In the Product-process matrix, the x-axis denotes volume and the y-axis denotes customization. O d. In the Product-process matrix, the x-axis denotes the degree of interaction and customization, and the y-axis denotes the degree of labor intensity. O e. a and d are true