Consider the following scenario: A mechanic does car service. During that service, it may be necessary to change the break unit. What is the relationship between the use cases "Car Service" and...

Consider the following scenario:

A mechanic does car service. During that service, it may be necessary to change the break unit.

What is the relationship between the use cases "Car Service" and "Change Break Unit"?

a) Car service extends Change Break Unit

b) Change Break Unit extends Car Service

c) Car Service includes Change Break Unit

d) Change Break Unit includes Car Service