Guests are arriving at a party at a rate of 12 per minute. Each guest will be checked in, served a drink, and accompanied to his/her table by one receptionist, one bartender, and one usher respectively. Both the receptionist and usher can serve 10 guests per minute, whereas the bartender takes 5 minutes to serve one guest. Which resource is the bottleneck and what is the process capacity in guests per minute?
(a) Bartender, 0.2
(b) Bartender, 5
(c) Usher, 5
(d) Receptionist, 10