A check digit is an extra character added to a numeric code as a device to test the accuracy of data entered into a computer system. Based on the modulus 11 method, which one of the following is the correct check digit for the original code, 1234? a. 1 b. 2 c. 3 d. 4 Question 5 Which of the following is not a database model discussed in Chapter 5: a. Relational b. Hierarchical c. Network d. Physical 1.82 pts