Suppose you have created a data model for an airline based on a variety of forms, reports, user interviews, data sources, etc. Your client comes forward with a new desired report that includes passenger weights and a relationship between passengers and employees, neither of which is in your E$-$R diagram. You should $\_\_\_\_\_\_\_\_.$

a$.$

add the relationship and the weight attribute to the existing data model

b$.$

add the relationship but not the weight attribute

c$.$

create a new, separate E$-$R diagram with just the new information

d$.$

add the weight attribute but not the relationship