Answer:
A waiter
Step-by-step explanation:
Specialization is the process of concentrating on and becoming an expert in a particular subject or skill. It can also be used to refer to the area on which someone becomes an expert. All the other options require years of gradual learning that builds up over the years for one to be considered an expert, asides for that of a "waiter"
Waiting does not require much training, and cannot be referred to as an area of specialization.