To orchestrate multiple actions within UML, a modeler should use StructuredActivityNodes:
A.Extending Behavior and adding desired Actions is not specifically about coordinating multiple actions; it's about defining new behaviors.
B.Correct. StructuredActivityNodes are a part of UML that provides a mechanism to group a set of actions together and manage the data flows between them, thus coordinating the actions.
C.Using the standard Action and adding desired tag values does not inherently coordinate actions.
D.Extending Action and specifying constraints to be relaxed or removed does not directly relate to coordinating other actions.
References:
UML Specification: Activities section, which describes the use of StructuredActivityNodes.
The use of StructuredActivityNodes for coordinating actions is elaborated in the UML 2.5 Documentation under Activity Diagrams.
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