Use the database shown in Figure 2 to work Problems 6-8. Note that the database is composed of four tables that reflect these relationships: An EMPLOYEE has only one JOB_CODE, but a JOB_CODE can be held by many EMPLOYEES. An EMPLOYEE can participate in many PLANs, and any PLAN can be assigned to many EMPLOYEES. Note also that the M:N relationship has been broken down into two 1:M relationships for which the BENEFIT table serves as the composite or bridge entity. Database name: Ch03_BeneCo Table name: EMPLOYEE EMP_CODE EMP_LNAME JOB_CODE 14 Rudell 15 McDade 1 16 Ruellardo 1 17 Smith 3 20 Smith 2 Table name: BENEFIT EMP_CODE PLAN_CODE 15 15 3 16 1 17 1 17 3 17 20 3 Table name: JOB JOB_CODE JOB_DESCRIPTION 1 Clerical 2 Technical 3 Managerial Table name: PLAN PLAN_CODE PLAN_DESCRIPTION 1 Term life 2 Stock purchase 3 Long-term disability 4 Dental 6. For each table in the database, identify the primary key and the foreign key(s). If a table does not have a foreign key, write None. 7. Do the tables exhibit entity integrity? Answer yes or no, and then explain your answer. 8. Do the tables exhibit referential integrity? Answer yes or no, and then explain your answer. Write NA (Not Applicable) if the table does not have a foreign key