When does the Status of a case change when a Work Status change is configured on an Assignment shape? (Choose One)

When does the Status of a case change when a Work Status change is configured on an Assignment shape? (Choose One)
A . When the Case reaches the Assignment shape and the Assignment Object is Created
B . Upon completion of the Assignment
C . At the start of the Flow (Process) containing the Assignment shape
D . On the Connector prior to the Assignment shape

Answer: A