The booking limits for four fare classes in a flight are given as b=(b1,b2,b3,b4)=(15,10,5,2).

(a) What is the available capacity for these four classes, i.e., what is the booking limit for classes {1, 2, 3, 4}? [ Select ] ["2", "5", "10", "15", "32"]

(b) From this available capacity, how many seats are protected for class 1, i.e., what is the protection level for class 1? [ Select ] ["2", "5", "10", "15", "32"]