What Must Be True for a Connector to Be Well

What must be true for a connector to be well formed if a delegation connector delegates to more than one target port?

A) The interfaces of the target ports must have no features in common.
B) The interface of at least one of the target ports must be signature compatible with the interface that is the type of the source port.
C) The interface of each of the target ports must be signature compatible with the interface that is the type of the source port.
D) The union of the interfaces of the target ports must be signature compatible with the interface that is the type of the source port.