"Question: You are testing a function that makes calls to an external service via an API.

Which of the following are reasons why we are not choosing to make real calls to the service?

a$)$ You want your tests to be self$-$checking

b$)$ You want your tests to be repeatable

c$)$ You want your tests to be fast

d$)$ You don$$t want to abuse the ser VF$18$ vice by sending non$-$important requests"