What are two functions of a TIBCO ActiveMatrix BusinessWorks Critical Section Group? (Choose two.)

What are two functions of a TIBCO ActiveMatrix BusinessWorks Critical Section Group? (Choose two.)
A . escalates the execution priority of the grouped activities
B . isolates resource-intensive activities for performance tuning
C . controls concurrent accesses to shared resources
D . synchronizes process instances so that only one executes the grouped activities at a time

Answer: C,D