Answer:
The door in the face technique
Step-by-step explanation:
With the information provided, the answer is that Sam used the door in the face technique because this is a method in which a person tries to convince another one of something by making a big demand that is unreasonable and that will be denied, so the person will accept another request that is reasonable and this is what Sam did as he requested a $10,000 a year raise that was denied and then, asked for a $5,000 a year raise that his boss accepted.