The booking limits for four fare classes are given as b$=($b$1,$b$2,$b$3,$b$4)=(20,15,5,2).$ Suppose that no bookings are made at the moment. The following parts are dependent. a$)$ Can we accept a request for $4$ bookings for class $3?[$ Select $]["$Yes$","$No$"]$ What is the current $($cumulative$)$ booking vector B after processing this request? $[$ Select $]["(0,0,0,0)","(0,0,4,0)","(4,4,4,0)","(3,3,3,3)"]$ b$)$ Can we accept a request for $2$ bookings for class $4?[$ Select $]["$Yes$","$No$"]$ What is the current $($cumulative$)$ booking vector B after processing this request? $[$ Select $]["(0,0,0,0)","(4,4,4,0)","(0,0,6,0)","(6,6,6,0)"]$ c$)$ Can we process a cancellation of $2$ bookings for class $3?[$ Select $]["$Yes$","$No$"]$ What is the current $($cumulative$)$ booking vector B after processing this request? $[$ Select $]["(0,0,0,0)","(0,0,2,0)","(2,2,2,0)","(4,4,4,0)","(6,6,6,0)"]$ d$)$ Can we accept a request for $3$ bookings for class $3?[$ Select $]["$Yes$","$No$"]$ What is the current $($cumulative$)$ booking vector B after processing th