How the Leader Node Maintains and Migrates the Collaborative Processing

Multiple Choice

How the leader node maintains and migrates the collaborative processing group. Arrange the following steps in correct order
A: sensors are selected to acquire new measurements using the sensor selection algorithm
B: after the leader is elected, it initializes a belief state as uniform disk centered at its own location
C: as the target moves, the sensors that did not previously detect may begin detecting

A) c b a
B) a c b
C) b c a
D) b a c